To demonstrate additional differences, look at the image below that shows the difference between the two upper receiver square forge marks. 204 Ruger Varmint Upper 24-inch 6.5 Sporter Varmint Upper 20-inch. Nothing consistent between these three carbines in the new CR family. M16 Pistol Kits Varmint Upper Halves > 16-inch 5.56 NATO Varmint Upper 20-inch 5.56 NATO Varmint Upper 24-inch 5.56 NATO Varmint Upper 24-inch 1-14 5.56 NATO Var Upper 24-inch 6mm PPC Varmint Upper 24-inch. In order to identify a converted M16 (series) rifle, the training barrel is. Anyway, here is the information that I posted.īelow is a photo showing three of my recent purchases (within the last 60 days) and their upper receiver markings. The simunition system consists of reduced-energy marking cartridges and. The only markings I can see are on the top of the barrel near the muzzle, it says 'R 5.56 NATO 1/9'.
223 Remington & 5.56×45mm NATO 1:7: 1 right hand twist every 7 inches (178 mm) 5.
223 Remington (US M193) or 7.62×39mm 1:10: 1 right hand twist every 10 inches (254 mm) 9×19mm NATO 1:9: 1 right hand twist every 9 inches (229 mm). I understand why the marking variations happen and I’m ok with it because I believe I’m still getting quality parts. Picked up a 'custom' AR in trade and like a true dumbass, the guy I got it from has no idea who made the barrel. 1:12: 1 right hand twist every 12 inches (305 mm). I personally have zero issue with the marking variations but I know some people are losing their minds. Over on, in the ‘Industry/Colt’ section, there is some discussion about the variance in upper receiver markings of current Colt CR series carbines and rifles. If you follow me on any of my social media accounts, you may have already seen this information but I wanted to post it here too.
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