It is important that during initial installation that a small amount of grease is placed on the tapered shoulder of the screw to prevent screw galling against the softer rail. Note: The hardened screws used in this handguard are tapered at the base to provide a flush, smooth fit. 1.375" Crowfoot wrench required for barrel nut installation.This rail will attach to a low-profile - but the top rail of the handguard will not match the receiver.A low-profile DPMS receiver will measure. reliable rifle Lightweight 35-50 Carbon Fiber At 12 oclock is a full-length Picatinny accessory rail The BAD Workhorse Patrol AR-15 Carbine is a solid. 210" or 3/16" thick from the top of the receiver reail to the charging handle cut out. A "High-Profile" / SR-25 / DPMS receiver will measure approv."High-Profile" / SR-25 / LR308 rifles with a pre-2009 "DPMS" / Knights Sr-25 Pattern. 308 AR pattern rifles with a 1-7/16-16" receiver thread (DPMS. Overall weight with attachments: 13.4 oz.1.550" Internal Diameter is Compatible with most Low Profile Gas Blocks.Machined from 6005A-T5 Aluminum Extrusion.Light, Strong and Compact Free-Floating Rail Design.In addition to a lighter, sleeker rail profile, the barrel nut design was retained from the original T.R.I.M rail to make it simple for users to easily swap the older Wilson Combat T.R.I.M rail design with this new M-Lok version. Our precision machined three, six, and nine O’Clock M-Lok positions enable fast, easy mounting of multiple shooting accessories popular across the shooting industry. The oversize and tough nitrocarburized 4130 steel barrel attachment nut reduces heat transfer and the ergonomic handguard design offers a sleek, non-abrasive platform for comfortable dynamic shooting. Machined on 5-axis CNC machines from high-strength 6005A-T5 aircraft aluminum with a smooth Mil-Spec hard anodized finish, the rail handguard/interface and its robust mounting system won't sacrifice strength, stability or accuracy over bulkier designs. The Wilson Combat M-Lok AR handguard system has been designed by our engineering team to be among the lightest, strongest and most versatile compact free-floating rail systems on the market.