After reading the AR-10 and .308 AR FAQs, and doing some poking around, I tried to come up w/ a listing of which magazines fit which .308 AR variant, as well as the other rifles those magazines fit. As I'm interested in the .308 AR platform, but don't own one, all the following are from the FAQs, manufacturer websites or product reviews on the net, or my imperfect inferrence:
FN FAL metric magazines:Rock River LAR-8Bushmaster BAR-10 (discontinued)(inferred)
Armalite AR-10B (modified)Kel-Tec RFBFN FAL (and copies)
L1A1 (and copies)
L1A1 magazines:Rock River LAR-8 Bushmaster BAR-10 (discontinued)
L1A1 (and copies)
BREN .308
Thermold FAL magazines:Rock River LAR-8
Bushmaster BAR-10 (discontinued)
FN SCAR-H (modified)(inferred)
L1A1 (and copies)
BREN .308 (inferred)
FN FAL (and copies)
Kel-Tec RFB (inferred)
Moses Mag metric magazines:Rock River LAR-8 (modified)
Bushmaster BAR-10 (discontinued)(modified)(inferred)
Kel-Tec RFB (modified)
FN FAL (and copies)
L1A1 (and copies)
FN SCAR-H (modified)Moses LAR-8 magazine:Rock River LAR-8
Bushmaster BAR-10 (discontinued)(inferred)
FN SCAR-H (modified)(inferred)L1A1 (and copies)(inferred)
BREN .308 (inferred)
FN FAL (and copies)(modified)(inferred)
Kel-Tec RFB (modified)(inferred)
Rock River LAR-8 magazines:Rock River LAR-8
Bushmaster BAR-10 (discontinued)(inferred)
FN SCAR-H (modified)(inferred)L1A1 (and copies)(inferred)
BREN .308 (inferred)
FN FAL (and copies)
Kel-Tec RFB (inferred)
M-14 magazines:Armalite AR-10B (modified)
M-14
M-1A
Mossberg MVP .308Ruger Precision Rifle (some issues reported)
Thermold M-14/M-1A magazine:M-14
M-1A
Mossberg MVP .308(inferred)Ruger Precision Rifle (inferred)
Armalite Type 1 magazine:Armalite AR-10B
M-14
M-1A
Mossberg MVP .308(inferred)Ruger Precision Rifle (inferred)
AR-10B Gen 2 magazines:Armalite AR-10B
Noveske N6 (discontinued)
Aero Precision (discontinued)
H&K G-3 magazines:H&K G3/91 (and copies)
Cobb Mfg MCR-200 (discontinued)Bushmaster MRC (discontinued)CMMG (discontinued)Thermold HK-91 magazines:H&K G3/91 (and copies)
Cobb Mfg MCR-200 (discontinued)(inferred)
Bushmaster MRC (discontinued)(inferred)
CMMG (discontinued)(inferred)
FN SCAR-H magazine:FN SCAR-H
Moses SCAR magazine:FN SCAR-H
Thermold SCAR magazine:FN SCAR-H
Molon Labe Industries magazines:FN SCAR-H
H&K 417 magazine:H&K 417
Original Armalite AR-10 waffle mag:Armalite AR-10
SR-25/DPMS pattern magwells (modified)
https://www.ar15.com/forums/AR-15/Brownells-Retro-Dutch-AR-10-It-s-Official-/123-723047/?page=4#i7607415HAC-7 (modified)SR-25/DPMS pattern (also Magpul, et al) magazines: Armalite AR-10 (original)(discontinued) (Original Armalite mags will not fit modern guns w/o modification. Modern mags won't fit original Armalite receivers w/o modification.)Knight's SR-25
DPMS (Gen 1 & 2)
Bushmaster .308 ORC
Armalite AR-10A
Armalite AR-10B (modified)Mossberg MVP .308"Colt LE 901
Handl Defense lower for the FN SCAR-HCav Mfg lower for the FN SCAR-HRuger Precision Rifle
most other AR .308 platforms on the market
(discontinued) means that model is no longer made.
(modified) means the magazine requires modification to fit that particular rifle
(inferred) means I am inferring the magazine will fit that rifle, based on other information - it's not real world experience or published information
(and copies) means copies or derivatives made by other manufacturers
If there's a magazine type I've missed, or my inferences are incorrect, or I got bad info from somewhere, please post up. I'll try to add as many links to manufacturer's info & other links as I have time for. I find it fascinating that Mossberg got their MVP .308 to feed from both M-14 and AR-10 pattern magazines.
19 Aug 2015. Added the Ruger Precision Rifle, which one upped the Mossberg MVP - the Ruger also feeds from AICS single-stack mags.
9 Sept 2015 - added RRA's LAR-8 mag. And Molon Labe's SCAR-L mags.
20 July 2020 - added HAC-7