11.5" Carbine Barrels

[Hmac]

10.5s are perfectly fine and have been ran in special units for quite a few years.....no problems with my DI 10.5 or. 7.5 piston.....having the right size gas port is essential though.

Yup. No doubt. I'd have no worries running a 10.5 built by a reputable firearms mfgr or skilled armorer. Noveske makes a 10.5 that is tuned to perfection, I hear. The OP is building his SBR. What size gas port should he be drilling in his 10.5?

[tact]

Yup. No doubt. I'd have no worries running a 10.5 built by a reputable firearms mfgr or skilled armorer. Noveske makes a 10.5 that is tuned to perfection, I hear. The OP is building his SBR. What size gas port should he be drilling in his 10.5?

It all depends on the manufacturer as some are more gassed than others, but there is plenty of data out there now for most flavors.