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M4A1 CQB-R是在M4A1的下机匣上安装了经过改进的特种作战上机匣(CQB-R)而成,于2000车装备美国特种部队,该枪为近战型卡宾枪,枪托缩回时全枪长仅686mm,非常适合狭窄空间内的携行与战斗。该枪枪管长262mm。较标准型的M4A1卡宾枪短。枪口焰较大。包覆式的皮卡汀尼导轨护手,可方便安装各种附件,如战术灯、垂直式小握把、激光指示器等。
The M4A1 CQB-R is equipped with a modified Special Combat Casing (CQB-R) mounted on the lower casing of the M4A1. The M4A1 CQB-R is equipped with US Special Forces in 2000 and is a melee carbine. All gun length is only 686mm, ideal for carrying and fighting in a narrow space. The gun barrel length 262mm. Shorter than the standard M4A1 carbine. Muzzle larger flame. Cover Picatinny rail guard, easy to install a variety of accessories, such as tactical lights, vertical small grip, laser pointer and so on.