I am looking at this barrel it looks like a nice barrel for a good price but it is a mid gas length. I am worried that a mid length gas system is going to be a bit long for a 12.5 barrel. Have any of you shot a 12.5 inch barrel with a mid gas system.
I've read carbine is best for 14.5" and shorter. Midlength 16-18", Rifle 18"+. No experience with a midlength 12.5" so it might work. Or go 11.5" and use a Daniel Defense, BCM, or many other quality barrels.