Hi Guys,

Just got the mp15SportII back from the factory. Bolt carrier was
replaced and rifle test fired. Havent shot it yet but just wanted to
let you know what happened.

Rifle was sent back on Aug. 3 and received Aug. 7 It arrived in the middle of their shutdown period. It was cleared to be shipped back Aug. 31, and in shipping until Sept. 10. Apparently shipping is way behind in shipping returns out, also
with the Labor Day Holiday.

Paper documentation reported that bolt was replaced. In looking at it, the bolt carrier was new, but other bolt parts looked like the originals. Bolt carrier seems to have different staking. The punch marks are on the side rather than the top of the gas key screws. Apparently the gas key was the problem, and they replaced the whole bolt carrier assembly.

I'll try to get it out this weekend, but I don't think I'll have any
problems. As Mistwolf said, the problem was in the gas key or gas rings. S&W didn't share a lot of info on the repair, and that's OK as long as it works.

It was tough to send it back and wait, but I think I saved myself a lot of aggravation in replacing parts on my own at my expense, instead of letting S&W fix it. They appeared to do a good job, but we'll see when it goes to the range.