Optimized For Long-Range Shooting; More Compact Than Standard Rifle Barrel
The Special Purpose Rifle (SPR) barrel replicates the barrel of the Mark 12 Mod X Intermediate sniper/designated marksman rifles used by some special operations groups. This 5.56 NATO chambered, 18" barrel with a 1-7" twist easily handles the heavier bullets needed for long-range precision shooting, while still offering a more compact platform than the standard 20" rifle. Constructed from 416R stainless steel and finished with a bead blasted matte finish. Rifle-length gas system provides reliable extraction at lower pressures.
AR-15, Issue:09, Page:018
Big Book Catalog, Issue:66, Page:018
SPECS: 416R Stainless Steel. Bead Blasted finish. 18" long. Chambered for 5.56 NATO. .750" O.D. at gas block. ½"-28 tpi muzzle threads.