UTG PRO AR15 Low-pro Quad-rail Gas Block for .75" Barrel is perfect for any modified weapon system. This picatinny rail low profile gas block attachment from UTG Pro is perfect for mounting flip-up iron sights, tactical flashlights and tactical laser lights. Use this UTG Pro Model 4/15 Low Profile Quad Rail Gas Block Rail System with an M4/AR15 rifle and give yourself the tactical advantage.image Proudly Designed and Made in USA