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This is intended for 5.56/.223 and has the same 1/2x28 threads that will be on the muzzle of the Colt. Should work great. https://guntecusa.com/product/ar-15-3-prong-flash-hider/
Trevor D.
6 years ago
Monty, this will fit your Colt CRM16A1 Retro .223 caliber perfectly Sir. ((Specifications and Features)): - GuntecUSA AR-15 3 Prong Flash Hider AR-3PRONG - .223 Remington/5.56 NATO - Threaded 1/2x28 TPI - Steel Black Oxide.
James G.
6 years ago