|The Provectus Quad Rail offers a larger inside diameter designed to accommodate your suppressor or for those that like the feel of a full sized quad rail. At 1.8” inside diameter your suppressor easily fits inside and the cutouts on the rail aid in rapid cooling. The Provectus Rail System features anti-rotation tabs, built in non-rotating QD sling mounts, scalloped rails that allow you to run without rail covers, hard anodize coating and super looks. The Provectus is available in two different lengths, 9”(13.1oz), 13”(18.6oz). Installation is a breeze using the standard USGI barrel nut wrench and ships with all mounting hardware.