Mk12modh clone - Precision Reflex AR-15/M16 Round Free Float Carbon Fiber Extended Forearm

PRI does not include instructions with anything they make. So you best have some skills before attempting to install their components. Installation requires a strap wrench or their custom wrench, which is just stupid that they make you buy it for $10. You do need one of these because I got it as tight as possible by hand and it worked loose on the first trip to the range. The rail interfaces with the barrel nut so it is critical that the barrel nut is lined up correctly. It is very difficult to get it to align top dead center without the use of the recce rail. If you place loctite on the hand guard threads, use a very small amount. The threads are fine and I was unable to get it back apart without a heat gun.