I've been hearing that S&W changed the the barrel on the 15 Sport. Supposedly, they have gone from the melonite treated 1 in 8 twist 5R barrel to a melonite treated 1 in 9 twist with standard rifling.
The old barrel is still supposed to be available on some of their higher end AR's.
If true, I figure it's a cost saving method. It may also have to do with how many of the old style barrels they can get. It really makes sense for the market S&W is shooting for with that gun.
For now, I'm glad mine is the old style. But, the new one could prove to be super accurate like the old style has.
When I was buying mine, I debated between it and a PSA. I chose the Sport because of the barrel. I hope that the new barrel ends up being as good as the old one.


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