The DPMS 7 Inch Kitty Kat - YHM 9630DX Quad Rail - KX3 Piggy Brake upper features a DPMS 7 inch chrome-lined Kitty Kat barrel chambered in 5.56 NATO with a 1:9 twist rate, pistol length gas system and 1/2-28 threaded muzzle.  Built on an M4 ramped, milspec flattop receiver with a lo-pro gas block, YHM-9630DX rail, and a Noveske KX3 piggy brake.

These are assembled and test fired by PK Firearms.

The Yankee Hill Machine 16 inch Fluted - CAR Plastic Handguard - YHM-9394 Front Flip Sight upper features a Yankee Hill Machine 16 inch fluted barrel chambered in 5.56 NATO, with a 1:7 twist rate, carbine-length gas system and a 1/2-28 threaded muzzle.  Barrel has an M4 ramped extension, is manufactured from 4140 steel, heat treated to RC 25-32, and contains diamond fluting which improves rigidity and aids in barrel cooling.  Built on a milspec M4 ramped flat top receiver with a carbine length plastic handguard, YHM-9394 front flip sight and an A2 flash hider.

Daniel Defense 16 inch Cold Hammer Forged barrel with M4 ramped extension, manufactured from ordnance-grade 4150 Chrome Moly Vanadium  alloy steel for exceptional strength, and magnetic particle inspected (MPI) to ensure there are no internal flaws in the metal. Installed on a Milspec Flat Top receiver with 5.56 chrome lined bore and chamber, 1/7 twist, F marked front sight, A2 flash hider and a Magpul MOE Dark Earth carbine length handguard.  Available with Black, Dark Earth, or OD Green handguard.  Select color option at checkout. 

The Daniel Defense - 11.5 inch - CAR - Noveske NSR-11 - KX3 Piggy Brake upper features a Daniel Defense 11.5 inch CMV (Chrome Moly Vanaduim), CHF (Cold Hammer Forged), chrome-lined, heavy phosphate coated barrel chambered in 5.56 NATO with a 1:7 twist, M4 ramped barrel extension, carbine length gas system and 1/2-28 threaded muzzle.  Built on an M4 ramped A3 flattop receiver with low profile gas block, Noveske NSR-11 rail, and a Noveske KX3 Piggy Brake.

These are assembled and test fired by PK Firearms.