A semi-auto modern sporting rifle with direct impingement operation, this FN M4 Carbine Military Collector is a military replica with exacting specifications. The aluminum flat-top receiver is hard-coat anodized for durability and sports a MIL-STD-1913 rail at the 12 o'clock position for easy mounting of optics and accessories. The barrel is chrome-lined with a permanently attached A2-style compensator, and, like the M4A1, this rifle offers an ambidextrous selector switch. Other features include a 6-position collapsible stock, A2 pistol grip, ergonomic magazine release, and A2-style front and adjustable rear sights. This M4 Carbine Military Collector accepts standard AR-style magazines.