LMT CQB MRP Piston Upper
* 16" free floating, chrome-lined, 1/7 twist, 5.56 NATO barrel can be changed out by removing two screws
* Piston-Driven for cleaner, more reliable operation
* M4 feed ramps
* Monolithic quad rail upper receiver with T-markings (RAS type)
* L7S1KIT (torque wrench, driver, (3) black rail panels and operators manual)
* H2 buffer
Purchased 1/4/10. Took it to the range 5 times to break it in and test it with various ammo. 450 rounds fired through it. Cleaned after each range trip. No issues with any of the ammo that I tested - Hornady TAP 5.56 75gr, American Eagle XM193, PRVI M193, PRVI M855, PMC Bronze .223 55gr, Wolf Military Classic .223 55gr.