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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.
The barrels and flash suppressor were replaced with the longer 14.5-inch (370 mm) barrel with a 1-in-12 twist, but the weapons retained their original designations. With the change to M855 cartridges, they either received 1-in-7 twist barrel or complete upper receiver assembly replacements.
Colt Carbine (AR-15A2 Government Carbine) (Special export model with receiver block and large pin upper receiver) 3rd Generation Short Ribbed S-1 A2 Yes Yes 5.56 NATO 16 in. A1 1:7 Yes/No A2 R6530 Sporter Lightweight .223 3rd Generation Short Ribbed S-1 A2 Yes Yes 5.56 NATO 16 in. A1 1:7 No A2 R6550 AR-15A2 Government A2 Ribbed S-1 A2 Yes Yes
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Among these items were over forty-five AR-15 upper receivers and five M-16 upper receivers, which Aguilera annotated, "These kits contain all the parts of an M-16 except for the lower receiver unit, which is the 'firearm' by lawful definition," admitting that neither the noise complaints nor the items ordered were necessarily illegal.
QF stands for quick firing, UD for upper deck, BD for between decks and CP for central pivot. Gunner with early fixed round, 1942. QF Mark I: adopted after failure of a 5-inch gun project and used a fixed round, which proved to be somewhat heavy for the loaders to keep up the intended firing rate. Was fitted in twin mountings UD Mark III.
The VT 11.5 was based on the prewar DRG Class SVT 137 and the innovative designs by Franz Kruckenberg [2] as well as on the experiences with the postwar DB Class VT 10.5. [3]
The Ak 5 (Swedish: Automatkarbin 5 ⓘ, English: Automatic Carbine 5) is a license-built Swedish version of the Belgian FN FNC assault rifle, with certain modifications, mostly to adapt the weapon to the partially subarctic Swedish climate.