Mk12 Douglas 18" stainless steel SPR profile barrel, 1:7 5.56 NATO

The Mk12 Mod 0 and Mod 1 SPR were the Special Purpose Rifles developed for Navy SEALs and USSOCOM shooters who needed precision fire in a 5.56 NATO platform. At the heart of every clone-correct Mk12 is one thing: the Douglas 18.1" stainless steel SPR-profile barrel, custom chambered and profiled by Compass Lake Engineering — the same shop that built originals.

This is the real article. Match-grade Douglas stainless, 1:7 twist, 5.56 NATO chamber cut to SPR specification, and the correct SPR contour. Compass Lake crowns, chambers, and inspects each barrel to the same standard that put these rifles on target in Iraq and Afghanistan. Finish it polished stainless for a Mod 0 build or have it GunKote gray by Potomac Armory to match Crane-built Mod 1 rifles.

If you are running a Precision Reflex URX, OPS Inc. 12th Model collar, or any reference Mk12 upper, this is the barrel that ties the build together. No shortcuts, no generic 18" blanks — this is the SPR barrel as it was meant to be cut.

Build it clone-correct or do not build it at all. Order yours today and complete your Mk12 with the barrel the originals wore.