Is there a standard port size that should be on 7.5" and a10.5" barrel. Now am I going to get emry bodies opinion or is there a standard. Don't get me wrong about PEOPLES OPINION but I would also no is there a written standard?
Posted: 3/12/2015 12:37:43 AM EDT
[#1]
The standard, which I guess we can use the Mil Spec for the 10.3" CQBR upper which is .070. it will reliably cycle a wide range of ammo with a H2 buffer.
LMT (reportedly) has a .073 port on it's 10.5 barrel.
