Which barrel to use with T91 front sight assembly?

[darkarmour]

I bought a T91 front sight assembly from the Store, but am now trying to figure out what barrel I need. The gas piston length requires the front sight assembly to sit somewhere between where it would sit on an intermediate length and a carbine length barrel. A standard carbine barrel will not work, as the gas port is drilled in the wrong location for the T91 gas piston and front sight assembly.

Randall of AR15Barrels says CMMG used to make a barrel that you could turn down as appropriate, but he does not know if they still make one.

Any ideas, folks?

[e292644]

Any AR-15 Mid-Length gas system barrel with 0.750" gas port journal should work. They all need to re-profile the gas port journal shoulder toward barrel extension about 0.50" (actual specs may vary due to every barrel mfg has slightly different specs.) to re-align piston rod with BCG.

I bought a T91 front sight assembly from the Store, but am now trying to figure out what barrel I need. The gas piston length requires the front sight assembly to sit somewhere between where it would sit on an intermediate length and a carbine length barrel. A standard carbine barrel will not work, as the gas port is drilled in the wrong location for the T91 gas piston and front sight assembly.

Randall of AR15Barrels says CMMG used to make a barrel that you could turn down as appropriate, but he does not know if they still make one.

Any ideas, folks?

[darkarmour]

Thanks. I'll try this.