The Yankee Hill Machine 14.5 inch - CHROME LINED - YHM-9630DX - YHM-9394 Front Flip Sight upper features a Yankee Hill Machine 14.5 inch - Chrome-lined, fluted barrel, chambered in 5.56 NATO, with a 1:7 twist, carbine length gas system and a permanently attached YHM-28-5M1 Phantom muzzle brake.  Built on an A3 flattop receiver with M4 feed ramps, YHM-9630 DX  CAR diamond rail, and a YHM-9394 Front Flip sight gas block with bayonet lu

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.

The DPMS 16 inch M4 - CHROME-LINED - Doublestar 416 Quad Rail upper features a DPMS 16 inch M4 CHROME-LINED barrel manufactured from 4140 steel, chambered in 5.56 NATO with M4 feed ramps, 1:9 twist, carbine length gas system, steel front sight tower with bayonet lug and sling swivel and a 1/2-28 threaded muzzle.  Built on an M4 ramped, mil-spec flat top receiver with a Doublestar 416 quad rail, and an A2 flash hider.