Enhanced, Monolithic, Semi Monolithic AR-15 Uppers

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Cold_Bore_88

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Jul 13, 2013
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The Woodlands, TX
#1
I am planning a “SPR/GPR” build and wanted to see if there were any upper receivers I should consider outside of the ones listed. I would like to use a monolithic, semi-mono, enhanced, etc. upper to reduce flex on the barrel. Ideally I would buy a mega mml but zev, in all their wisdom, decided to stop making them again.

LMT - proprietary barrels
Aero Enhanced
Seekins (these have large forearms)
Icon (former mega)
Ridgeline Defense (can you buy just a receiver?)
Cobalt kinetics
Sons of Liberty Gunworks
Vltor (key mod only?)


What am I forgetting?
 
Last edited:
#2
Cold_Bore_88 said:
I am planning a “SPR/GPR” build and wanted to see if there were any upper receivers I should consider outside of the ones listed. I would like to use a monolithic, semi-mono, enhanced, etc. upper to reduce flex on the barrel. Ideally I would buy a mega mml but zev, in all their wisdom, decided to stop making them again.

LMT - proprietary barrels
Aero Enhanced
Seekins (these have large forearms)
Icon (former mega)
Ridgeline Defense (can you buy just a receiver?)
Cobalt kinetics
Sons of Liberty Gunworks
Vltor (key mod only?)


What am I forgetting?
Click to expand...
If this a larger frame build I would look at ZEV.
 
#4
Cold_Bore_88 said:
Standard frame AR-15. I don’t think zev makes the MATEN anymore with the integrated nut.
Click to expand...
Yea I didn’t see the AR15 part in the title.

The monolithic Maten. Upper is no longer made by Zev correct. But their receiver sets are awesome. I would still recommend their small frame receivers as well. But there are so many options in that group
 
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#16
LRRPF52 said:
That recent post of a Cobalt Kinetics positional POI shift test got my attention. There was very minimal shift compared to all the other groups people have posted up in that thread.
Click to expand...
I called them this morning. I may go that direction mainly because the ID is sized about right. Not too big, I don’t plan to nest a suppressor, and not too small, I can still use an adjustable clamp gas block.
 
#17
_Windrider_ said:
Not the monolithic though. That was stopped due to patent issues
Click to expand...
Yep, LMT has the monolithic patent https://patents.google.com/patent/US8234808B2/en?oq=us8234808
Colt also makes one under license and a spanking from LMT, several barrel lengths. This is the new iteration 11.5 IAR
I just got mine, its a heavy little pig but pure awesomeness!!! I also have a 14.5 6940
cool story; https://smallarmsreview.com/the-colt-iar6940-infantry-automatic-rifle/
this 11.5 is a contract request from the FBI HRT "supposedly"
 
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#19
the ridgeline or seekins seem nice for a precision build

the aero seems nice for a general use type setup

I am very happy with the seekins I ordered

still waiting on aero handguard to come in to set up an 11.5" off of an aero enhanced
 
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#21
Here’s a few different types of monolithic and semi monolithic uppers.
LMT, Mega, Seekins, Ridgeline
 

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