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Glock 21SF: The 21SF is a version of the Glock 21 that uses a Short Frame lower which is based on the standard G21 frame (same width), but reduces trigger reach from the back of the grip by 2.5 mm (0.098 in), and the heel of the pistol is shortened by 4 mm (0.16 in) so the trigger can be reached and operated better by users with smaller hands.
For example, a popular caliber in the United States is .45 ACP. It is among the largest practical handgun calibers in use, featuring a .452 inches (11.5 mm) diameter bullet. With well-made expanding ammunition, a .452 bullet often expands to .70 caliber or larger. With a 9 mm Luger cartridge, the normal .355 bullet may expand to .50 or larger ...
The other used on gas operated firearms, usually a small hole on the barrel/gas block that is used to push back a gas piston to unlock the bolt. Gas check: A device used in some types of firearms ammunition when non-jacketed bullets are used in high pressure cartridges, to prevent the buildup of lead in the barrel and aid in accuracy. [17]
A ballistic chronograph or gun chronograph is a measuring instrument used to measure the velocity of a projectile in flight, typically fired from a gun or other firearm.The instrument is often useful for tasks such as gauging the utility of a firearm or safety of non-lethal projectiles fired from items such as a paintball gun or BB gun.
The neck is sized for .224 caliber bullets. 25-45 Sharps : Uses the standard military 5.56x45 case (also .223 cases), the neck is simply expanded to .257" 6.5mm Grendel :The Grendel uses the same head and rim from the .220 Russian and the 7.62x39 with a rim diameter of 0.441-0.449. The 6.5 Grendel bullets have a true diameter of 6.71mm / 0.264 ...
The Warsaw Pact 5.45×39mm M74 assault rifle round exemplifies a trend that is becoming common in the era of high velocity, small caliber military rounds. The 5.45×39mm uses a steel-jacketed bullet with a two-part core, the rear being lead and the front being steel with an air pocket foremost.
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.44 AMP (uses the .44 Magnum bullet).357 AMP (uses the .357 Magnum bullet).300 AMP (uses the .30 Carbine bullet; necked down at a different shoulder angle than the .30 LMP).45 Win Mag.45 ACP (experimental only).475 Auto Mag (experimental only, uses the .475 Wildey Magnum bullet) Lee Jurras.41 JMP (Uses the .41 Magnum bullet) Kent Lomont