MRP-H QUAD 7.62MM ASSEMBLED UPPER RECEIVER The patented LMT Monolithic Rail Platform, MRP(TM) upper receiver. The receiver and handguard are made from a single piece of forged aerospace aluminum. The barrel is held in place with a proprietary locking system that utilizes two locking bolts accessible from the right side of the receiver. The only tool needed is a standard T-30 Torx bit to tighten the bolts. This receiver requires the patented LMT monolithic barrel assembly which has a low profile gas block with straight gas tube. The MRP-H QUAD 12.75 monolithic upper receiver for large caliber rifle platforms. Includes quad rails with 19.25a ^2 on 12 o'clock rail, 9&Pr Mfg: Lmt Defense