IMI Defense Enhanced M4 Stock w/Polymer Cheek Rest Black. The Cheek Rest provides an enhancement to the extended M4 Enhanced Stock and allows an easy adjusted height to receive the optimal buttstock's functionality. Specifications for IMI Defense Enhanced M4 Stock w/Polymer Cheek Rest: Manufacturer: IMI Defense Gun Model: M4 Stock/Brace Material: Polymer Gun Type: Rifle Weight: 2 kg Fabric/Material: Polymer Features of IMI Defense Enhanced M4 Stock w/Polymer Cheek Rest Fully adjustable cheek rest Non-Slip unique tractiondesign Easily assembled anddisassembled (shipped as an assembly) Lightweight and strong No gunsmith required Package Contents: IMI Defense Enhanced M4 Stock w/Polymer Cheek Rest What firearm models does the manufacturer say IMI Defense Enhanced M4 Stock w/Polymer Cheek Rest is compatible with? The manufacturer says that IMI Defense Enhanced M4 Stock w/Polymer Cheek Rest is compatible with M4IMI Defense IMI-ZS200BLACK: Enhanced M4 Stock w/Polymer Cheek Rest Black