LMT MRP 12.5″ 5.56 Midlength Barrel
This LMT 12.5” Chrome Lined 5.56×45 1:7” RH barrel is designed to match the LMT MRP or MRP CQB quick-change barrel systems.
The gas system has already been installed to match your MRP upper receiver. To install this barrel, use the factory torque wrench to release the retaining bolts at the base of your handguard, swap this barrel in, and tighten the bolts down to LMT’s spec. If you want to change calibers or barrel lengths, we offer several other MRP barrels to match your needs.
This barrel was specifically designed to compliment the L7Z1A “Spec War” upper receiver. The short dwell time of the gas system creates an optimal recoil impulse and gas pressure for both suppressed and non-suppressed shooting while maintaining expected reliability.
Features:
- 12.5” Chrome-lined 1:7” RH Barrel for MRP or MRP CQB Monolithic Upper Receivers
- 5.56×45 Caliber
- Cryogenically treated for maximum durability
- Low profile gas block
- Mid Length straight gas tube
- A2 Birdcage Pre-Installed
This barrel is made for the LMT CQB/MRP Monolithic receiver. It will not fit MWS receivers.


Andrew (verified owner) –
Rooftop really hooked it up with keeping these barrels in stock. The barrel itself is built like a tank and will be treated as such. It runs perfectly suppressed and unsuppressed. I have it paired with a LMT enhanced bolt, so it will survive the apocalypse and then some.
Zach H. (verified owner) –
Drops in the Specwar MRP torqued to 140 in lbs and shoots like a dream. Buy the torque wrench with it too since it’s already set to spec.
Ryan (verified owner) –
Product is great and I will always try and order from them when possible! Sol is the man.
BigJ50cal (verified owner) –
Best DI build, soft shooting, sub MOA, works perfect with B&T XH RBS or HUX TI flow thru