- \n\t\t\t
- \n\t\t\t\t
![\"Right-side](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_1-1-300x200.jpg\")
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- \n\t\t\t\t
![\"Left-side](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_2-1-300x200.jpg\")
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\n\t\t<\/div>\n\n<\/p>\n
Once again, the driving force behind this article is the desire to highlight the designers’ choices and compare them with those of the Charter Arms revolver.<\/p>\n
- \n\t\t\t
- \n\t\t\t\t
![\"Photos](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_3-1-300x200.jpg\")
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- \n\t\t\t\t
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_4-1-300x200.jpg\")
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- \n\t\t\t\t
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_5-1-300x200.jpg\")
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\n\t\t<\/div>\n\nThe firearm shown in the pictures is in its original, untouched condition (\u00ab\u00a0dans son jus\u00a0\u00bb). It has been briefly cleaned, but nothing more. This will be the subject of further discussion in the conclusion.<\/p>\n
<\/div>\nFirearm Presentation<\/strong><\/h2>\n
The Backup II is a small defensive pistol produced from 1993 to 1998 by the manufacturer AMT. The company was founded in 1977. Arcadia Machine and Tool (AMT) was a firearms manufacturer based in Irwindale, California. Firearms production by AMT appears to span from 1982 to 1995. Since that date, the company has been acquired several times, eventually landing with High Standard (at least at the time of writing). Looking at the latter company’s website, one cannot say that AMT products are heavily represented.<\/p>\n
![\"Commercial](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/amt-sales-flyers-1995-380-backup-ii-1-216x300.jpg\")
<\/p>\nYou can find more details here regarding the models originally offered by AMT. The company built its firearms around rapid part-forming processes\u2014specifically, investment casting. It is impressive to see that a high percentage of the total parts are made from blanks obtained through this process.<\/p>\n
![\"AMT](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_6-1-200x300.jpg\")
<\/p>\n<\/strong><\/div>\n<\/strong><\/div>\nFirearm Specifications :<\/strong><\/h3>\n
- \n
- \n
- \n
- Caliber: .380 Auto, 9mm Browning Short, 9x17mm ;<\/span><\/li>\n
- Overall Length: 149 mm ;<\/span><\/li>\n
- Overall Height (with magazine): 94 mm ;<\/span><\/li>\n
- Overall Height (without magazine): 101 mm ;<\/span><\/li>\n
- Width: 23.5 mm ;<\/span><\/li>\n
- Weight (with empty magazine): 462 grams ;<\/span><\/li>\n
- Weight (with magazine loaded with 5 rounds): 507 grams ;<\/span><\/li>\n
- Magazine Capacity: 5 rounds ;<\/span><\/li>\n
- Materials: Stainless steel, plastic, aluminum.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
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- \n\t\t\t\t
![\"Left-side](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_7-2-300x200.jpg\")
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_8-2-200x300.jpg\")
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![\"Right-side](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_9-2-300x200.jpg\")
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\n\t\t<\/div>\n\n<\/p>\n
<\/div>\nThis pistol is a straight blowback firearm; in other words, it is an unlocked breech system. The pressure is not high enough to require locking the slide to the barrel before the bullet leaves the muzzle and the pressure drops. The inertia of the slide, the force of the recoil spring, and the cocking of the hammer are among the forces that delay the opening of the slide. The mechanism is simpler, and the parts are less complicated to build and assemble. This type of action cannot be used with all calibers.<\/p>\n
According to CIP standards for the 9mm Short caliber (.9x17mm, .380 Auto):<\/p>\n
- \n
- \n
- \n
- Average maximum pressure: 1,500 bar<\/span><\/li>\n
- Average proof pressure: 1,950 bar<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_10-1.jpg\")
<\/p>\n<\/p>\n
<\/p>\n
The .380 Auto is an excellent caliber. Due to its low operating pressures (resulting, as seen above, in simple, blowback firearms), the bullet’s velocity is subsonic. Consequently, the use of a sound suppressor is highly effective. It achieves this with a heavier bullet weight than the 7.65mm Browning (.32 ACP). This means higher impact energy, but also a steeper trajectory drop. Keep this in mind and test it whenever you get the opportunity.<\/p>\n
<\/div>\nThe Frame<\/strong><\/h2>\n
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![\"Right-side](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_11-1-300x200.jpg\")
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- \n\t\t\t\t
![\"Left-side](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_12-1-300x200.jpg\")
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\n\t\t<\/div>\n\n<\/div>\nFrame Specifications:<\/strong><\/h3>\n
- \n
- \n
- \n
- The frame (without the barrel) fits within a bounding box of: 120 mm x 73 mm x 16 mm (the height increases to 88.5 mm if the barrel is included).<\/span><\/li>\n
- Material: Stainless steel<\/span><\/li>\n
- Magazine well dimensions: 28 mm x 11.66 mm<\/span><\/li>\n
- Number of parts: 12<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
<\/p>\n
The frame of a pistol, much like that of a revolver, is a master component that integrates the locations for major functions: housing for the trigger mechanism, housing for the sear mechanism, housing for the hammer, housing for the hammer spring, the magazine well, the barrel seat, and the slide guide rails. This requires extensive, critical machining on a single part that ultimately serves as a junction\u2014or, to use a trendy word in the contemporary firearms world: a platform.<\/p>\n
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_13-1-300x200.jpg\")
<\/p>\nSome of these functions depend on one another. Each is a link in a chain where manufacturing tolerances affect the overall length of that chain. The gunsmith’s role is to harmonize the whole assembly.<\/p>\n
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![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_14-1-200x300.jpg\")
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- \n\t\t\t\t
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_15-1-200x300.jpg\")
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\n\t\t<\/div>\n\n<\/p>\n
There is no firing pin safety; a grip safety (an investment-cast part) at the back of the grip restricts sear travel when the shooter’s hand does not fully depress the grip.<\/p>\n
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- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_16-1-300x200.jpg\")
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- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_17-1-300x200.jpg\")
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- \n\t\t\t\t
![\"\"](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_18-1-300x200.jpg\")
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\n\t\t<\/div>\n\n<\/p>\n
Machining a trigger housing often involves a complex set of operations. On the Backup II, this is not the case. Two simple machining operations… and it works.<\/p>\n
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- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_19-1-200x300.jpg\")
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_20-1-300x200.jpg\")
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\n\t\t<\/div>\n\n<\/p>\n
The grip panels are made of black plastic.<\/p>\n
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- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_21-1-300x200.jpg\")
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_22-1-300x200.jpg\")
<\/a>\n\t\t\t<\/dt><\/dl>
\n\t\t<\/div>\n\n<\/div>\n<\/div>\nThe Barrel<\/strong><\/h2>\n
There are several ways to secure a barrel in place. Here, the barrel is welded to the frame. This is an unusual choice. A fixed barrel enhances accuracy. However, since we are examining a defensive firearm, accuracy is not its most demanded attribute. Therefore, the fixed barrel was likely chosen not for accuracy, but rather to simplify manufacturing. Machining marks are present around the weld, proving that an operation is performed after welding to reduce any potential excess thickness.<\/p>\n
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_23-1-300x200.jpg\")
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\n\t\t<\/div>\n\n<\/p>\n
The barrel measures: 67 mm (including the chamber).<\/p>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_26-1-200x300.jpg\")
<\/p>\n<\/p>\n
The barrel walls are thin. The outer diameter is: 12.8 mm. CIP standards dictate the following bore dimensions for this caliber:<\/p>\n
- \n
- \n
- \n
- Land diameter: 8.84 mm<\/span><\/li>\n
- Groove diameter: 9.04 mm<\/span><\/li>\n
- Rifling twist rate: According to the manufacturer: 1 turn in 16 inches (406 mm); according to CIP standards: 1 turn in 250 mm.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
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\n\t\t<\/div>\n\n<\/p>\n
<\/p>\n
The internal diameter of the chamber is: 9.62 mm. This results in a wall thickness at the chamber of: 1.59 mm.<\/p>\n
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_29-1-300x200.jpg\")
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![\"Top](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_30-1-300x200.jpg\")
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_31-1-300x200.jpg\")
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\n\t\t<\/div>\n\n<\/p>\n
The extractor slot is located on the top centerline of the barrel.<\/p>\n
<\/div>\n<\/div>\nThe Trigger and Hammer Mechanism<\/strong><\/h2>\n
The mechanism is quite simple, operating in single-action only. It consists of a trigger, a disconnector bar, a sear, and a hammer. The entire setup is driven by a few springs.<\/p>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_32-1-300x200.jpg\")
<\/p>\n<\/p>\n
Two safeties exist on this firearm:<\/p>\n
- \n
- \n
- \n
- A grip safety acting on the sear. If the operator does not fully depress the grip safety, the sear cannot rotate on its pin.<\/span><\/li>\n
- A safety lever on the left side, which also blocks the movement of the sear.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_33-1-300x200.jpg\")
<\/p>\n<\/p>\n
<\/p>\n
The trigger is produced via investment casting. The trigger spring sits in its center. A few spots of oxidation are visible.<\/p>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_34-1-300x200.jpg\")
<\/p>\n<\/p>\n
The disconnector bar consists of two parts. The thickness of this component is 1 mm. This part appears thin… but it works. A small cylinder is swaged onto it.<\/p>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_35-1-300x200.jpg\")
<\/p>\n<\/p>\n
The sear is an investment-cast piece. It features an extension on each side: on the left to limit movement via the manual safety, and on the right for the rear grip safety and the disconnector bar. The sear of the firearm shown here is oxidized, as are several parts of the mechanism.<\/p>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_36-1-200x300.jpg\")
<\/p>\n<\/p>\n
The hammer is an investment-cast component. It is slotted in its center to accommodate the ejector. Two notches are cut into its base (a half-cock notch and a full-cock notch).<\/p>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_37-1-200x300.jpg\")
<\/p>\n<\/p>\n
The ejector sits in the middle of the hammer. It is made of stamped sheet metal.<\/p>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_38-1-300x200.jpg\")
<\/p>\n<\/p>\n
The magazine catch is a component with complex geometry. It would have been particularly time-consuming and expensive to produce by any method other than investment casting. The magazine catch is located at the base of the grip. The operator must shift their grip to extract the magazine. In an emergency scenario, there is less chance of accidentally losing the magazine than by pressing a push-button located near the thumb… a matter of personal preference.<\/p>\n
![\"Photo](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_39-1-300x200.jpg\")
<\/p>\n<\/p>\n
The grip safety is also an investment-cast part. Much like the disconnector bar, the walls of the grip safety are very thin. This demonstrates the precision of this process.<\/p>\n
<\/div>\nThe Slide and Simplification via Division<\/strong><\/h2>\n
The most significant aspect from a design perspective, which links this article to the previous one, is the slide. The slide alone followed the path of simplification via division. It is split into two parts, which I will refer to as the slide body and the breech block (see photos below).<\/p>\n
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_42-1-200x300.jpg\")
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_41-1-300x200.jpg\")
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\n\t\t<\/div>\n\n<\/p>\n
The slide fits within a bounding box of: 124.5 mm x 31.5 mm x 20.3 mm. It is made of steel. I believe the blank for this part is investment-cast. I say \u00ab\u00a0I believe\u00a0\u00bb because it is not glaringly obvious. What leads me to this conclusion is the shape of the hammer pocket. Since the hammer is enclosed, an internal pocket must be formed (similar to the Ruby pistol). On the Backup II, this pocket cannot be achieved through conventional machining (milling), as it lacks milling cutter marks (cutter radii; here, the corners are sharp). The investment casting is highly precise.<\/p>\n
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![\"Bottom](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_43-1-200x300.jpg\")
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- \n\t\t\t\t
![\"Bottom](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_44-1-200x300.jpg\")
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\n\t\t<\/div>\n\n<\/p>\n
The recoil spring and its guide rod sit beneath the barrel.<\/p>\n
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_45-1-200x300.jpg\")
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- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_46-1-300x200.jpg\")
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\n\t\t<\/div>\n\n- \n\t\t\t
- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_47-1-300x200.jpg\")
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- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_48-1-300x200.jpg\")
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_49-1-300x200.jpg\")
<\/a>\n\t\t\t<\/dt><\/dl>
\n\t\t<\/div>\n\n<\/p>\n
The slide is in two parts, which divides the manufacturing difficulty. This creates access where there previously was none, limiting potential scrap rates after complex machining operations. Choosing a removable breech block is also highly practical if the manufacturer produces the same firearm model in multiple calibers. If the slide body remains identical for different calibers, one only needs to change the \u00ab\u00a0breech block\u00a0\u00bb depending on the version. The Backup II pistol, however, only exists in .380 Auto.<\/p>\n
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- \n\t\t\t\t
![\"culasse.](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_50-1-300x200.jpg\")
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- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_51-1-200x300.jpg\")
<\/a>\n\t\t\t<\/dt><\/dl>
\n\t\t<\/div>\n\n<\/p>\n
The breech block is removable. It fits within a bounding box of: 35.3 mm x 14.8 mm x 14 mm. It is secured to the slide body by a slotted spring pin (roll pin, diameter: 3 mm). The force generated by the combustion gases does not bear upon this pin. In other words, the secondary component is not merely held in place by a spring pin; the designer integrated bearing surfaces for the breech block against the slide body. Upon firing, the pressure applied through the cartridge case presses the breech block against its rear stops within the slide body.<\/p>\n
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![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_52-1-300x200.jpg\")
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- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_53-1-300x200.jpg\")
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- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_54-2-300x200.jpg\")
<\/a>\n\t\t\t<\/dt><\/dl>
\n\t\t<\/div>\n\n- \n\t\t\t
- \n\t\t\t\t
![\"View](\"https:\/\/gunsmithdesigner.com\/wp-content\/uploads\/2018\/02\/AMT-Backup-2_55-1-300x200.jpg\")
<\/a>\n\t\t\t<\/dt><\/dl>
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
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- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- A safety lever on the left side, which also blocks the movement of the sear.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
- A grip safety acting on the sear. If the operator does not fully depress the grip safety, the sear cannot rotate on its pin.<\/span><\/li>\n
- \n
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- Groove diameter: 9.04 mm<\/span><\/li>\n
- Land diameter: 8.84 mm<\/span><\/li>\n
- \n
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- \n\t\t\t\t
- Material: Stainless steel<\/span><\/li>\n
- The frame (without the barrel) fits within a bounding box of: 120 mm x 73 mm x 16 mm (the height increases to 88.5 mm if the barrel is included).<\/span><\/li>\n
- \n
- \n\t\t\t\t
- Average proof pressure: 1,950 bar<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
- Average maximum pressure: 1,500 bar<\/span><\/li>\n
- \n
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- Overall Length: 149 mm ;<\/span><\/li>\n
- Caliber: .380 Auto, 9mm Browning Short, 9x17mm ;<\/span><\/li>\n
- \n
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