LMT Defense - MRP-H Quad Rail 12.75" AR10/AR308 Upper Receiver - LM308B1
LMT Defense
The LMT Defense MRP-H® M-LOK 12.5" AR10/AR308 Upper Receiver (R-LM308BML1) is built around the patented LMT Monolithic Rail Platform (MRP™) engineered for large-caliber platforms. Receiver and handguard machined from a single piece of forged aerospace-grade aluminum for maximum rigidity and zero flex. M-LOK compatible attachment points on all 7 sides provide maximum accessory mounting flexibility for lights, lasers, and other rail-mounted accessories.
The proprietary two-bolt barrel locking system uses a standard T-30 Torx bit — enabling fast, tool-minimal barrel swaps without a full armorer kit. Compatible calibers include 7.62×51 NATO (.308 Win), 6.5 Creedmoor, .243 Winchester, .260 Remington, 7mm-08 Remington, and .338 Federal. Barrel not included.