Replaces factory receiver end plate and provides three secure, ambidextrous attachment points for the push-button QD sling swivel. Made of hardened aluminum with extra metal at the stress points to ensure this mount won't fail during hard use. Rounded edges resist snagging on sling or other gear. Hardcoat anodized for extra strength and wear resistance, with a matte black finish that matches most factory buffer tubes. Heavy-duty stainless steel swivel accepts slings up to 1A 1/4" wide and allows a full 360Adeg of rotation. Mfg: Troy Industries SPECS: Mount - Aluminum, hardcoat anodized, matte black. Swivel - Stainless steel, matte black finish. Accepts slings up to 1A 1/4" (3.2cm) wide. M4 fits M4-style carbines with adjustable buttstock.