Koch HK416 Heckler & Koch HK 93 Heckler & Koch XM8 M4 carbine M16 rifle PVAR rifle Ruger Mini-14 SA80 SIG SG550 / 551 / 552 / 553 / 556 Steyr AUG CZ 805 BREN 7.62×51mm NATO AR-10A, and various firearms using SR-25 pattern magazines. FN FAL (no longer available) FN SCAR (modified FAL-pattern) Heckler & Koch HK91 and Heckler & Koch G3 M14 rifle AR-10B (modified M14-pattern) Performance evaluations Reliability A test in 2003 by U.S. Army soldiers in Afghanistan found the C-Mag unreliable in simulated combat conditions and reported frequent failures to feed among the issues; likewise, British Armed Forces trials found that the C-Mag did not give reliable performance when loaded with British-issue ammunition. The Beta C-Mag is not in widespread use by U.S. military forces, and has not been type-classified. In November 2008, the U.S. Army Experimental Task Force (AETF) at Fort Bliss, Texas, evaluated six Beta C-Mag magazines. Four magazines—two with black covers and two with clear covers—were used with M4 carbines in three firing scenarios: controlled pair, controlled burst, and rapid fire. According to the memorandum summarizing the evaluation, the four magazines "performed flawlessly in all three scenarios without jams or stoppages". Additionally, two magazines with black covers were evaluated with M249 light machine guns in controlled burst and rapid-fire scenarios. These also performed without "issues", according to the memo, which also notes that soldiers "had only positive comments" about the C-Mag magazines during the After Action Review (AAR). Test-fired with a Heckler & Koch HK91, Heckler & Koch G3 and two other Heckler & Koch-based weapons, the 7.62mm C-Mag was found to operate without problems in either loading or firing at rates up to 1,000 rounds per minute. See also Drum magazine Magazine North Hollywood shootout References External links Magazines (firearms) Firearm components