Installs instantly on most collapsible stocks. Made of rugged glass reinforced polymer to withstand harsh tactical conditions. No toolinstallation, snaps into place. Fits "ribbed" collapsible style stocks. Ideal with #CBS butt stock. No Gunsmith required. Mill-standard. For M4 Style stocks. CP1- Raise your eye level for proper sight or optic alignment - raise: 1.4cm. CP2- Raise your eye level for proper sight or optic alignment raise: 2.6cm.
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