AR15 upper receiver caliber conversion list

[CJ]

Okay, I've always wanted to compile a comprehensive list of upper receivers available for AR15 rifles, and all the various caliber conversions you can do. This doesn't mean a Delton upper vs. a CMMG or anything like that. I'm talking about caliber conversions, .45, 10mm, 9mm, 7.62x39, .300blk, etc. There are hundreds out there, and I have always wanted to make a list of the different ones available out there. If anyone else is interested in helping me that would be great, as I plan on compiling the list over the next week or so and I'll move it to the build forum. I realize there is going to be MANY different manfacturers in some of the calibers, but as long as we keep it of reasonable length I think the list would be useful. You might be surprised what's available. So try to keep the posts arranged in Caliber / Manufacturer / Model name.

5.7x28mm
AR Five Seven

7.62x25
RMW/Bazooka Brothers
cncgunsparts

9mm
Colt SMG 9mm
Rock River Arms 9mm
CMMG 9mm
Spikes Tactical 9mm
Yankee Hill Machine

10mm
Olympic Arms 10mm A2
RMW Extreme 10mm Upper DI

.45ACP
RMW AR15 A3 Flat-Top .45ACP BB

.410
T-14 AR-upper by ATI.

.458 SOCOM
Wilson Combat
Rock River
SBR Ammunition

.50GI
RMW .50GI 10.5"

.50 Beowulf
Alexander Arms .50 Beowulf

.204 Ruger
Sabre Defence .204

.300 BLK:
Noveske
AAC
DDM
CMMG
Red X

5.45x39
Model 1 Sales 11.5"
S&W M&P15 16"
Adams Arms 16" piston

7.62x39
Model 1 sales
Del-ton INC.

6.8SPC
Rock river
Bison armory
Wilson combat
Palmetto state armory
Model 1 sales
Stag arms

.450 Bushmaster
Bushmaster

.50 BMG
ALS Arms .50BMG
Bohica Arms Mk IV .50 BMG
Safety Harbor .50BMG
Tactilite T1 .50 BMG
Ferret .50 BMG
Watson's Weapons .50BMG

[IHaveAMustang]

5.45x39

Model 1 Sales 11.5"
S&W M&P15 16"
Adams Arms 16" piston

[Moose242]

7.62x25: RMW/Bazooka Brothers & cncgunsparts (both DI)

[brandon01rt]

.204 ruger - sabre defense. (Red x sells them)
.458 socom - Wilson combat, rock river, sbr ammunition
.50 beowulf - Alexander arms

[nightfly2000]

.410 T-14 AR-upper by ATI.

[CJ]

I didn't know there was a .410 upper. I guess it uses pistol shells?

[71pantera]

9mm yhm

[Moose242]

Dude, CJ, for your M16 you must get a 7.62x25 upper and magazine well block. They are even gas operated:

[YALE]

I didn't know there was a .410 upper. I guess it uses pistol shells?

Midway shows it to be discontinued, anyway.

[bottlerocket]

300BLK:
Noveske
AAC
DDM
CMMG
Red X

[brandon01rt]

6.8 spc
Rock river
Bison armory
Wilson combat
Palmetto state armory
Model 1 sales
Stag arms



450 bushmaster
Bushmaster

Edit: 6.5 grendel
Alexander arms

[nightfly2000]

I didn't know there was a .410 upper. I guess it uses pistol shells?

any .410! its very weak, doesn't have any penetration. kinda of a novelty upper really. i find them from time to time on gunbroker. u can convert standard USGI mags from what i have heard.

[MULEY4X4]

5.45x39 Spikes Tactical

[YALE]

any .410! its very weak, doesn't have any penetration. kinda of a novelty upper really. i find them from time to time on gunbroker. u can convert standard USGI mags from what i have heard.

It'll use 2.5" shells only. It won't use standard 2.75" or longer.

[nightfly2000]

It'll use 2.5" shells only. It won't use standard 2.75" or longer.

Huh,all i have are 2.5s. i didnt even think about the 2.75s. i know that some brands (2.5) still didnt fit in the mag, and it jams/stovepipes a lot.