Originally Posted by
taekwondopreacher
I currently own a M&P15 (I bought it in 2008 before I understood much about ARs) with the 1/9 twist. I've been thinking about upgrading the barrel to something with a 1/7 twist, and was looking for some input.
Is going to a mid-length gas system a big enough deal to justify the extra parts needed? I'm set on my next AR being a mid-length 16" gun from BCM or DD. Do mid-length guns really run that much smoother? Anyone own both a carbine and a mid-length system?
The other thing I'm wondering is if any of the M&P15 upper is suitable for using as part of a new build. Would it be feasible to install a new barrel on the M&P upper receiver, or am I wasting time buying anything less than a complete upper?
Thanks.