The Infamous “Diamond Cut” back works with ALL S63/PWR barrel tips. As the name suggests this barrel back is Diamond-Cut milled to match the milling on Diamond Skull CS3s, 180Rs and Geo R5s, but it's also the perfect way to add some style to any other PWR barrel system! Not only do the faceted cuts look great, they also create extra grip to remove your barrel when your hands are wet, muddy or slick.  Features Compatible with Planet Eclipse™ PWR inserts and the S63 Barrel System Assembled length: 14.5" (Tip + Back) Machined Diamond Cut for extra grip Compatible with stock PE S63/PWR barrel tip Windowless design allows for solid-color throughout; no mismatched inserts!