The .30 Cal patch jag is specifically engineered for cleaning .30 Cal barrels, including, but not limited to, 30 Carbine, .308, 30-06, .300, .303, 32 Win, 32 ACP, 32 H&R, .327 and 32 Rim. These patch jags apply a solvent- or bore paste-treated patch against the barrel and into the rifling to effectively remove carbon, plastic and copper deposits from the bore. For demonstration purposes, we used this patch without solvent and passed it through the barrel once. As evidenced, these jags outperform any other jag available on the market. The proof is on the patch. Beyond cleaning, our jags are also suitable for oiling the bore for storage and removing oil prior to firing. Our rifle jags are compatible with all rods featuring standard 8x32 threads. Precision-engineered patch jag crafted from high-grade brass for optimal durability and corrosion resistance Solvent-resistant, durable O-rings Compatible with all standard cleaning rods