Not really wanting to do this but for sale is the bolt carrier group from my Smith & Wesson M&P 15. My gunsmith ran at the most 20 rds through it after having my gas block installed, but that's it. I purchased a chrome bcg while he had the rifle so I could have a spare. So I'm selling the one from the M&P 15. The bolt is marked MP (magnetic particle inspected) which is basically a high tech way to test for defects in the steel. I tried to get pics of the roll mark but it was very difficult. If you have any questions, please ask.