Gunwiki: About 308 caliber AR-Family Rifles

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	This is by far the most popular 308 AR platform in existence. Until DPMS started cutting into their market, Armalite refused to license its receiver design.
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, the fate of the MCR system is up in the air.
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	Relatively new; 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.
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

Topic revision: r2 - 21 Apr 2010 - SeanNewton