Lmt monolithic upper. The LMT monolithic upper alone begins around the $900 range. The patented LMT Monolithic Rail Platform (MRP) upper receiver is the only AR-15 upper that incorporates the handguard and receiver as one component. This receiver requires the The LMT L7Y1A MRP-L Receiver is a bare monolithic MLOK upper receiver that fits intermediate-caliber cartridges with barrels larger than 14. The MRP-H M-LOK 15. Details The patented LMT Monolithic Rail Platform, MRP™ upper receiver. Jan 7, 2022 ยท The Monolithic Rail Platform (MRP) is LMT’s front runner monolithic upper coupled with their Modular Ambidextrous Rifle System lower (MARS). The barrel is held in place with a proprietary locking system that utilizes two locking bolts accessible from the right side of the receiver. Earn up to 932 Sweatshop Cash. The LMT L7RA1A full-size Receiver is a bare monolithic quad-rail upper receiver that fits intermediate-caliber cartridges with barrels between 14. This receiver requires The patented LMT Monolithic Rail Platform, MRP™ upper receiver. qdq0cwk5kahmhgasfoctzez9ew2xafy6wvz5i