MRP-L QUAD 5.56MM ASSEMBLED UPPER RECEIVER The patented LMT Monolithic Rail Platform, MRP™ 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-L QUAD 9.25 is the carbine length receiver designed for 10.5″ barrels up to 18″ barrels with quad rail at the 3, 6, and 9 o’clock positions. This receiver sports 5 QD sling swivel attachment locations. Barrel not included. The MRP-L QUAD 13.25 is the rifle length receiver designed for 14.5″ barrels up to 20″ barrels with quad rail at the 3, 6, and 9 o’clock positions. This receiver sports 5 QD sling swivel attachment locations. Barrel not included. SPECIFICATIONS: Weight: 1.424 lbs – 1.742 lbs Dimensions: 16.25 in – 20.25 in Caliber: .204 Ru, .300 BLK, 5.56×45, 6.8 SPC MRP Platform: MRP-L (Light)