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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

 
 
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Old 03-04-2007, 10:05 AM
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xenophobe xenophobe is offline
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Default AR Lower Receiver FAQ (56k beware) MMS, CMT, LAR, LMT compared...

Receiver FAQ Version 0.1 (please note this is still rough, and is not nearly finished)

I live in a ban state, so no luck getting Bushmaster, Armalite, DPMS or Colt into the mix. My apologies.

I see a lot of threads asking about Quality and Suggestions for which brand of receiver any particular person would buy, so I thought I might write this info I've posted in a number of places to have it's own thread.

There are currently FOUR manufacturers that produce the majority of lower receivers for the AR market. MMS, CMT, LMT and LAR receive orders from many licensed manufacturers who obtain an ATF variance to have them cut and logo receivers on their behalf. JVP and Superior Arms cut for a couple of different companies as well, but currently I will only focus on the four main manufacturers differences.

Mega, Stag (CMT), LAR and Barrett (LMT):



Not all inclusive, and a few brands have had more than one manufacturer cut their receivers. Many companies receive CMT and LMT cuts in the white and finish them themselves. I have not seen a LAR or MMS cut that was finished by a third party company.

LMT = LMT, Lauer(old), DS Arms, PWA, Eagle, Knights Armament, Barrett, Bushmaster (?)
CMT = Stag, RRA, High Standard, Noveske, Century (current), Global Tactical, CLE, S&W, MGI, Wilson Tactical, (some?) Colt, Ratworx
LAR = Grizzly, Bushmaster (L Prefix), Ameetech, (?)DPMS, CMMG, Double Star, Fulton
JVP = Double Star, LRB
MMS = Mega, GSE, Dalphon, POF (forged), Alexander Arms,
Olympic = Olypmic, SGW, Tromix, Palmetto, Dalphon, Frankford, (old) Century
Sun Devil = Sun Devil forged billet receivers
Superior = Superior Arms, Lauer (current)
Grenadier Precision

Characteristics of the manufacturers (please note, the most typical characteristics are listed, and each manufacturer may have substantial sample variation between lots):

LMT usually leaves forge flash underneath the trigger well, and roughly cuts them between the receiver extension and pistol grip, while leaving a vertical mold flash line on the front lip of the mag well, as well as having other "fingerprint" marks... no bevel cut for the charging handle on the rear lug for the receiver extension, as well as particular mill marks in between the pivot pin tangs. They also have a 'fingerprint' cut in the receiver on the shelf, and below it where the FCG goes. Notice the diagonal mill mark on one of the pivot pin supports. Also unique is the radius in the grip tang pocket, which is not as smooth a transition as the other manufacturers.


Last edited by xenophobe; 03-04-2007 at 10:18 AM..
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