“DIAMOND CUT” GRIP BARREL BACK (S63 AND PWR COMPATIBLE)Diamond Cut Grip Barrel Back (S63 AND PWR INSERT COMPATIBLE) This Diamond Cut Grip barrel back works with the ALL NEW Planet Eclipse PWR inserts and the S63 Barrel System. As the name suggests this barrel back has machined Diamond Cut Pattern to match custom Infamous milling on CS3, 180R and new GEO R5. The pattern not only looks great but adds extra grip when your hands are wet, muddy or slick. The solid back also eliminates the stock barrel back