View Full Version : LMT one piece upper change the barrel

10-30-2010, 9:00 PM
Hello, on the LMT one pice upper. can you change the barrel with any ar 15 barrel or does it have to be by LMT?????

10-30-2010, 9:06 PM
If you are talking about the MRP line, It will need to be from LMT.

10-30-2010, 9:12 PM
The MRPs have the quick-change barrel feature and require a special barrel extension. There are a few places that are providing a service of making any barrel you provide compatible with an MRP (GAP and DBMG come to mind).

10-30-2010, 9:26 PM
LMT barrels are interchangeable on the MRP -- LMT makes BBLS you can use in 6.8 SPC (needs new BCG and magazine) 204 Ruger, 5.56mm Gas Piston (needs new BCG) and various lengths of stainless short and long DI barrels.

Monolithic Rail uppers are the way to go:


Droppin Deuces
10-30-2010, 9:31 PM
Monolithic Rail uppers are the way to go:


Why is that? Just curious.

10-30-2010, 9:54 PM
Why is that? Just curious.

All your optics are on the same plane, more rigid, (less "flex" between receiver and fore end) facilitates the interchangeable barrel system, everything stays in place except the barrel switches out. No loose hand guards. I like the feel better.


Traditional --


Gas tube visible in the gap between receiver and for-end -- with a sling on the front swivel used improperly you could torque the barrel enough to throw off the alignment of the iron sights. That's not happening on a monolithic rail upper.

10-31-2010, 3:34 AM
The MRP will be my next rifle followed by the MWS. I held an MRP and the thing is rock solid there's no wiggle anywhere on the gun and with the ability to change barrel lengths, calibers, and go from piston to DI all while being a great manufacture.

10-31-2010, 11:24 AM
mine is a DI. does it ame a difference? initially I wanted a piston but i guess the conversion is too much. so i will just get a adams arms upper and maybe use the lmt swith a long barrel?

10-31-2010, 12:47 PM
No need for new upper.
You can just buy an LMT 5.56 piston Barrel and BCG and stick it in your MRP and then your gun will BE a piston gun
Barrel: $360
BCG: $260

10-31-2010, 10:57 PM
DI is fine don't get all wrapped up in that right now just get some ammo and shoot the hell out of it then get some optics and go take a class then go buy yourself a new barrel there's no need for a piston now.