CP1 / CP2 Raise Cheek Rest For Original Stock Raise Your Eye Level For Proper Sight Or Optic Alignment. Raise: CP1 – 1.4cm. CP2 – 2.6cm. Installs instantly on most collapsible stocks. Made of rugged glass reinforced polymer to withstand harsh tactical conditions. No tool installation, snaps into place. Fits “ribbed” collapsible style stocks. Ideal with #CBS butt stock – removing the side partitions is required.