JP Enterprises Enhanced Gas Ring .308 Black JPGR-308. No more worrying about keeping the gaps from lining up with these AR 15 Parts from JP Enterprises because there are no gaps. JP Enterprises Enhanced Gas Ring Units are machined to minimize friction between the rings and the bolt carrier for smoother operation and a better seal. Yet the edges of the rings still work to remove fouling with every shot. Order JP Enterprises Enhanced Gas Sealing Rings today so you have them handy next time you need to make a change. Specifications for JP Enterprises Enhanced Gas Ring: Manufacturer: JP Enterprises Quantity: 1 Features of JP Enterprises Enhanced Gas Rings System: Precision-grinding and engineering Perfect balance of a solid gas seal with a very low-friction relationship between rings and bolt carrier One-piece 3-layer construction Package Contents: JP Enterprises Enhanced Gas Rings Precision Ground JP Enterprises JPGR-308: Enhanced Gas Ring .308 Black