Hi,
I'm looking to buy an AR, and really want an M&P 15T. However, I'm bothered by the lack of 1 in 7" barrel. Only the most expensive aftermarket branded M&P 15 models (vtac, ts) seem to have the 1 in 7" barrels. Is it somehow cheaper to make a 1 in 9" barrel? Is there some advantage to 1 in 9" that I'm missing? Sure, must people probably use 69gr or lighter bullets, but it's my understanding that 1 in 7" will handle light bullets just as well as as slower twists while giving the owner good 75gr capability as well. I might buy a noveske instead due to the lack of 1 in 7" twist.