The development of the C7 paralleled that of the M16A2 by Colt. A Canadian Forces Liaison Officer worked with the Marines in the M16A1 Product Improvement Program and relayed information to Canada's Rifle Replacement Program Office. The C7 for all intents and purposes is much like earlier M16A1E1s, rather than final product M16A2s. The earliest C7s were actually manufactured by Colt for Canadian Forces as the Colt Model 715. Like earlier M16s, it can be fired in either single shot or automatic mode, instead of the burst function selected for the M16A2. The C7 also features the structural strengthening, improved handguards, and longer stock developed for the M16A2. Diemaco changed the trapdoor in the buttstock to make it easier to access and a half-inch spacer is available to adjust stock length to user preference. The most easily noticeable external difference between American M16A2s and Diemaco C7s is the retention of the A1 style rear sights. Not easily apparent is Diemaco's use of hammer-forged barrels. The Canadians originally desired to use a heavy barrel profile instead of the M16A2 profile, but Colt denied permission. Also, Diemaco has developed a different mounting system from Colt for the M203 grenade launcher for the C7 rifle family.
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