Hello everyone, new guy here. After lurking for a long time and picking up tips and tricks here and there, I decide to give the ULW buffer a try. I also run a RCA lightweight carrier. I started having the same problem with the bolt (not the ULW) after about 100 or so rounds. What seemed to be light strikes turned out to be the bolt not returning into battery. The bolt was not closing the extra 1/16 in to fire the round. After a pleasant and informative conversation with Tim at TACCOM, we found out that only rifles equipped with the RCA lightweight bolt were experiencing the same problem. He recommended to exchange the the RCA bolt gas rings with a Mcfarland one piece gas ring. WHAT A DIFFERENCE. Instant smoothness of the bolt reciprocating in the carrier. Turns out the gas rings that came with RCA bolt were causing enough friction in the carrier to cause the bolt to not return to battery. A problem that was only able to be seen after going to a ultra lightweight buffer like TACCOM's. The Mcfarland gas ring is only about 5 bucks.Depending on the source, you might be able to find it cheaper. I say give it try with the new Mcfarland gas ring before getting rid of the ULW buffer. When in doubt give Tim @ TACCOM a call. You won't regret it.
Once again, Thank you Tim at TACCOM for the advise on getting my ar back up and running.