Well.....here is the main deal as I stated before, making a DI pistol caliber rifle is a real PITA. Ron (RMW) makes it seem like it's something to be taken granted. I love his work and I bought his products, but my main two gripes are the above type attitude, and his use of fair cheap AR ancillary parts. Let's focus on the just the bolt and bolt carrier. There is no nice way to put it, but the modified bolt was junky out of the gate and the fit in the carrier was crap - in the sense: It probably would be fine with most all full powered rifle rounds, but the sticking and the digging and the hanging up of the bolt was driving me nuts. I fixed it by: using the stock set up with metal polish on the rings and working it by hand (a LOT of hard junk came out metal - chrome and steel), then I replace the rings with a single piece gas ring. Super duper smooth and easy now.
http://www.rmwxtreme.com/#top