06-18-2011, 02:36 PM
I've used the lapping tool from Brownell's(still use it) but I really haven't found an upper that was so obviously out that its done anything. I've broken one bolt a couple of years ago in my 6.5 CSS build on an AA billet upper. The bolt was a Model 1 bolt I had for a spare. I had been running a DPMS bolt and never had an issue. The Model 1 bolt broke the lug in less than 10 rounds. That rifle now runs a LMT Enhanced bolt. I have the DPMS for a spare. Model 1 sent me a new bolt and its just sitting on the shelf.
