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308 AR Compatibility Chart

There are several manufacturers of 308 caliber AR-family rifles now. Most of them will interchange with one system or another, and it can be tough to keep track of which one's which.
  • Please note that AR-10 and DPMS magazines will not interchange!
Make Model System Magazine Notes
Aeroprecision SPR-2 Armalite AR-10 These are identical to Armalite's AR-10 receivers.
Armalite AR-10 Armalite AR-10 For decades, this was by far the most popular 308 AR platform in existence. Until DPMS started cutting into their market, Armalite refused to license its receiver design. The more-open DPMS pattern far surpassed it in market share in the 2010's.
Bushmaster Bushmaster 308 RRA FAL Bushmaster designed a 308 AR-10 style rifle, then lost interest and sold it to RRA.
CMMG MK-8 DPMS DPMS, G3 Use of G3 mags requires modification of upper (slight widening) at a machine shop on standard uppers. JG Machining, of San Diego, offers pre-widened uppers.
Cobb MCR-200 Cobb G3 Cobb's system is completely proprietary, and is not compatible with any other lower manufacturer. Since Cobb was purchased by Bushmaster in 2007, the MCR has been buried and there is little chance of its revival.
DPMS TAC-20 DPMS DPMS DPMS came up with their own system, but have allowed other manufacturers to make compatible receivers.
Fulton ??? DPMS DPMS Fulton's 308 receivers are milled from billet, like POF's, and carry a comparable price tag.
Hesse HAR-25 Armalite AR-10 Roughly made receivers which, after some gunsmithing, can become functional Armalite-type receivers.
JD Machine PR3 DPMS DPMS JD upper receiver needed to use G3 mags in CMMG directly
Kaiserworks KR-7 DPMS DPMS,Magpul Do not confuse with Kaiser Defense
LaRue Stealth OSR ??? SR-25/DPMS Mags are compatible with M110, which is SR-25 compatible.
Noveske N6 Armalite AR-10 Noveske is a premium rifle manufacturer. Expect quality to meet or exceed that of a basic AR-10.
POF MP-308 DPMS DPMS These receivers are compatible with the TAC-20 system, however they are expensive because they're made from billet.
Quentin Defense QD-10 DPMS DPMS Available as either 100% or 80% offerings.
Remington R-25 DPMS DPMS Available at present only in oak camoflauge. Multiple calibers available.
Rock River Arms LAR-8 RRA FAL LPK unknown; design acquired from Bushmaster, name changed from LAR-10 due to Armalite lawsuit. Inch or metric mags usable; some 308 Bren mags as well.
Vulcan HAR-25? Armalite AR-10 Roughly made receivers which, after some gunsmithing, can become functional Armalite-type receivers. Vulcan sold the rights/inventory to Hesse.

About AR-10, DPMS, and SR-25 Magazines

Every source I've read says that DPMS and SR-25 magazines are cross-compatible. That is to say, you can exchange magazines between DPMS 308 rifles and SR-25's, with no issues. This is not the case for AR-10 magazines, which seem to be their own entity.

About G3 Magazines

The G3 magazine will work with certain CMMG lowers. However, it requires a wider upper receiver than the standard. As of 12/15/09, the only manufacturer making these wider upper receivers is JD Machine, of San Diego. It is possible to make a G3 magazine fit with any other DPMS upper, however it requires milling some aluminum off of your upper receiver.

-- SeanNewton - 15 Dec 2009

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Topic revision: r4 - 26 Nov 2016 - SeanNewton
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