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The Faxon Firearms AR-15 Goverment/Socom Profile Threaded Barrel does not include an adjustable gas block. Included is the Faxon 3 Screw low profile gas block (non-adjustable).
These barrels will fit the M&P-15 Sport 2 receiver, however, the front sight tower and handguard will not be compatible. This listing is for barrels that include a gas block, but you will likely need a new handguard and gas tube to suit the barrel.
No, the barrels do not come with a barrel nut.
The 16" barrels will use a standard AR-15 mid length gas tube such as this: https://faxonfirearms.com/faxon-ar-gas-tube-mid-length/
The 14.5" and 16" 5.56 NATO barrels use a Mid-Length gas system and the gas block is low profile and designed to fit under most AR-15 free float handguards.
The Faxon Firearms AR-15 Gunner Profile Threaded Barrels 10.5in model uses a pistol length gas system.
Yes. The 14.5" Faxon Firearms AR-15 Gunner Profile Threaded Barrel will fit your DB15. It features a 1:8 twist rate, 0.625" gas block diameter, and 1/2x28 threads.
The .300 Blackout model of the Faxon Firearms AR-15 Gunner Profile Threaded Barrel has a thread pitch of 5/8x24.
The Faxon Firearms AR-15 Gunner Profile Threaded Barrel uses 5R grooves and comes with the Anti-rotation pin on the barrel. It will fit a Palmetto State Armory upper, and any upper that accepts AR15 style barrels.
The gas block is a low-profile pattern and should fit under nearly all free float handguards. The slot for the pin should not interfere with the installation of other gas blocks.