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Quoted: Just the receiver? LMT no longer sells the receiver separately so you will have some trouble finding them. They are out there though. CMT are available all over. I've had 3 LMT's in my hands and 7 or 8 CMT's. In general the CMT's were finished better.
| I own both LMT and CMT uppers. The CMT uppers do have a better finish. Otherwise quality is the same. I like to use LMT uppers if I can though only because I have a few LMT (not LCW) lowers.
As far as BCG's go, both are good, not much difference. One difference is that the CMT is available from many vendors with a MP tested bolt. I don't believe the LMT is MP'ed, its not marked anyway.
| The LMT is MP tested as well. IMHO, the LMT is a better assembly, especially out of the box. The LMT includes the Crane O ring and the black bumper (at least all of mine have). I know that none of my CMT BCG's have included the O ring. I'm not sure if they came with the black or blue bumper though. I'd have to double check. The main reason that I prefer the LMT is the carrier key bolt staking. The CMT staking is probably just fine (although I always restake my CMT key bolts) but the LMT is done correctly and does not require restaking even if you are very anal about how your key bolts are staked. Generally te LMT is about $10 more than an MP tested CMT. That's a pretty small difference on the whole.
I use CMT uppers and CMT M16 carriers with CMT MP tested bolts in my builds.
| I use both LMT and CMT uppers and M16 BCG's in my builds. Any combination of these parts will serve you well.
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I've never seen any proof that I can recall that stated LMT bolts were MP'd so if they are that's great. It would be nice if they were marked.
You are correct about staking of the key, I always restake the key on the CMT as well. I also add the o-ring myself as I have a bunch of them. The finish on the both seem to be equal.
The CMT BCG are less expensive and more available then the LMT. Same as the receivers. I dont run LMT lowers so I have no need to run LMT uppers. I've been using GTS lowers and the CMT uppers fit perfectly. Color match is decent also.
I had 3 complete LMT M4 uppers and I've sold them all. I bought into the hype and wasn't that impressed. No park under the FSB, straight pins instead of dowels and average finish on the uppers made me change my direction. I now build all my own uppers using selected parts starting with CMT uppers. YMMV
Am I anal and somewhat a "gucci gear" type builder? Yeah I guess so. I've been building for 9 years now and most of that was low buck junk through college and the ban years. Today is a new age in AR building so many options and I'm done building junk and settling for something a little cheaper.
Oh and rebby when you get the Mopar running, you can run me in my Nova