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The Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.
A .17 HMR round with a ballistic tip (left) compared with a .22 Long Rifle round (right) Cartridges for .17 HMR come with bullets that weigh 15.5 grains (1.00 g), 17 grains (1.1 g), and 20 grains (1.3 g), and come in designs such as plastic-tipped bullets, hollow points, soft points, and FMJs.
Since the .17 HM2 is based on the .22 LR, converting most bolt action firearms chambered in .22 LR to .17 HM2 requires only a barrel change. The higher pressure makes conversion of semi-automatic firearms more difficult, as virtually all are blowback designs that are sensitive to pressure changes. Conversion kits have appeared, and they replace ...
The .17 Remington is based on the .223 Remington case necked down to .172 in (4.37 mm), with the shoulder moved back. [5] [6]Extremely high initial velocity (over 4,000 ft/s 1,200 m/s), flat trajectory and very low recoil are the .17 Remington's primary attributes.
The Germans sought to develop a select-fire intermediate powered rifle combining the firepower of a submachine gun with the accuracy and range of a rifle. This was done by shortening the standard 7.92×57mm cartridge to 7.92×33mm and giving it a lighter 125-grain bullet, that limited range but allowed for more controllable automatic fire.
The FN Model 1924 series is a line of Mauser Gewehr 98 pattern bolt-action rifles produced by the Belgian Fabrique Nationale.They are similar to the Czech vz. 24 rifle, however have an intermediate length (215mm/ 8.46 in.) action, featuring open sights, 7.65×53mm, 7×57mm or 8×57mm IS chambering, Long rifle, Short Rifle and carbine-length barrels, hardwood stocks, and straight or curved bolt ...
The others were eight .308-caliber AR-10-type rifles, one .308-caliber Ruger American bolt-action rifle, and one .38-caliber Smith & Wesson Model 342 revolver. [ 21 ] [ 23 ] [ 24 ] Some of the AR-15 rifles were fitted with vertical forward grips and bump stocks , [ 21 ] [ 23 ] the latter of which allowed for recoil to actuate their triggers at ...
The original design basis was a zero-point ground acceleration of 250 Gal and a static acceleration of 470 Gal, based on the 1952 Kern County earthquake (0.18 g, 1.4 m/s 2, 4.6 ft/s 2). After the 1978 Miyagi earthquake , when the ground acceleration reached 0.125 g (1.22 m/s 2 , 4.0 ft/s 2 ) for 30 seconds, no damage to the critical parts of ...