ALL SALES FINAL GLR-16 AR15/M16 Buttstock The GLR-16 Buttstock for your AR15/M16 provides you with enhanced versatility with it's stock extension and optional adjustable Cheek Rest. Advantages: Uniquely designed rubber butt pad for fast and stable shoulder positioning Unique patented "Anti-Rattle" mechanism, fits perfectly on MIL-SPEC and commercial after-market buffer tubes Three Integrated Slots for Sling Attachment, One in the Front and Two at the Rear Two Ambidextrous Metal Quick Release Rear Sling Mount Points Water-resistant anti rattle storage compartment for two CR123 or AA batteries Maintains Contour & Size of Original Design Made from fiberglass reinforced polymer composite Available in the GPCP Version with an Adjustable Cheek Rest & Dual Picatinny Raills, or in the Standard GCP Version with an Adjustable Cheek Rest.