New BCM barrel on M&P

[Nectarp]

I have a M&P 15 that im changing the barrel on, im prob gonna buy a BCM barrel but use the M&P bolt has anyone had experince changing out barrels on the M&P with using the old S&W bolt. My bolt seems to be MPI so headspace should be ok but just wanted some opinions thanks,

 

[MichiganScott]

Buy the headspace gauges and be sure. Blown cartridges are no fun.

 

[Fkimble]

I always have my barrel guy fit a new bolt with each barrel. No worries, no problems. Nice tight headspace.

 

[Desert Five-0]

Why are you changing your barrel?

 

[Nectarp]

I am changing my barrel because ig going to a mid length gas system, i just bought a supressor, the M&Ps from whatvive read and heard are already overgassed i want to try and eliminate as much blow back as possible not to mention I have a ML gas system my other AR and love it

 

[lagavulin62]

I'm not trying to argue or get you to change your mind but what if you built a new upper with that barrel, complete with it's own bcg? I must admit I'm biased against taking off existing barrels. It has always seemed so drastic to me when you can just change the upper out. But whatever works for you.

 

[MichiganScott]

OK, rule of thumb: you can get away with using a new bolt on a used barrel, but there is no guarantee that you can use an old bolt on a new barrel. Get the headspace gauges.