Diemaco C7s retained the M16A1 style L-type flip, aperture rear sight adjustable with two settings: short-range 0 to 300 m (0 to 328 yd) and long-range 300 to 400 m (328 to 437 yd). The carrying handle and rear sight assembly on top of the Diemaco C7 receiver features the most noticeable external difference between American M16A2s and C7s. For the furniture Diemaco chose Fiberlite nylon reinforced polymer and detailed the furniture suitable for CRBN decontamination and cold weather use at −68 ☌ (−90 ☏). Diemaco changed the trapdoor in the buttstock to make for easier access to a small storage compartment inside the stock, and a 13 mm (0.5 in) spacer is available to adjust stock length and hence length of pull to user preference. The C7 also features the structural strengthening, spent case deflector, improved handguards, and longer stock developed for the M16A2. Like the M16A1 and M16A3, the C7 has both semi-automatic and fully automatic fire modes.
The C7 series of firearms is driven by the same Stoner bolt and carrier gas system as the M16 series. The earliest C7s were manufactured by Colt for Canadian Forces as the Colt Model 715. The C7 is much like earlier M16A1E1s, rather than final product M16A2s. A Canadian Forces liaison officer worked with the United States Marine Corps in the M16A1 Product Improvement Program and relayed information to Canada's Rifle Replacement Program Office. The development of the C7 assault rifle paralleled that of the M16A2 by Colt. It has been utilized in various combat deployments by Canadian, British, Norwegian, Dutch, and Danish forces in Afghanistan, Iraq, and Mali. It is also the standard firearm of the Dutch air force (C8A1) and other specialist users within the Dutch and British militaries. Following trials, C8 variants are general issue firearms for the United Kingdom's Special Forces. The C7 and its variants have been adopted as the standard issue rifle by the militaries of Canada, Norway (special forces only), Denmark and the Netherlands.
The Colt Canada C7 is a Canadian family of military rifles, manufactured by Colt Canada (formerly Diemaco prior to 2005), having similar design and function to the Colt M16A3.
550 m (600 yd) (with magnifying optical sight)
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