What Calibers are available for the AR platform

I would like to get a list going for all available calibers as long as they work with the standard AR15 lower reciever not AR10 lowers. I know the basics but would like to know all of the wildcat calibers. Please only list ones that are in production or will come into production not one-off prototypes made for the fun of it. If something is obscure and only available from 1 or so manufactures please provide links. I will update in my original post. Thanks guys

I'll start, but someone needs to fill in the holes

17 Mach IV
17 Remington
19 Calhoun
20 Tactical
204 Ruger
222 Remington
221 Fireball
223 Remington
6-223 (6x45)
6.5 MPC
7x40 (old 3 gun round)
6.5 x 33 (6.5 Whisper)
7 Whisper
6 WOA
6 - 6.8
223 - 6.8 (various names)
6.8 SPC
9mm
22LR
17 Mach2 or whatever it is called
5.45 x 39
7.62x39
10mm
45 ACP
40 Super
40 S&W
357 Sig
7.62x25
9x23
50AE
44 Mag
44 AutoMag
357 AutoMag
440 CorBon
40 X (40-50AE)
502 TS (rebated 50AE)
458 SOCOM
499 LW
50 Beowulf
450 Bushmaster
500 Phantom
223 WSSM
243 WSSM
25 WSSM
30 WSSM
410 ga
32 ACP (Tromix prototype)
300 Whisper
338 Whisper
338 Spectre
7 BR
6.5 BR-R (rebated rim)
6.5 Grendel
30 PPC
6 PPC
7.62x39 AI

That should do for now ...

Originally Posted By MartytW: I'll start, but someone needs to fill in the holes 17 Mach IV 17 Remington 19 Calhoun 20 Tactical 204 Ruger 222 Remington 221 Fireball 223 Remington 6-223 (6x45) 6.5 MPC 7x40 (old 3 gun round) 6.5 x 33 (6.5 Whisper) 7 Whisper 6 WOA 6 - 6.8 223 - 6.8 (various names) 6.8 SPC 9mm 22LR 17 Mach2 or whatever it is called 5.45 x 39 7.62x39 10mm 45 ACP 40 Super 40 S&W 357 Sig 7.62x25 9x23 50AE 44 Mag 44 AutoMag 357 AutoMag 440 CorBon 40 X (40-50AE) 502 TS (rebated 50AE) 458 SOCOM 499 LW 50 Beowulf 450 Bushmaster 500 Phantom 223 WSSM 243 WSSM 25 WSSM 300 WSSM 410 ga 32 ACP (Tromix prototype) 300 Whisper 338 Whisper 338 Spectre 7 BR 6.5 BR-R (rebated rim) 6.5 Grendel 30 PPC 6 PPC 7.62x39 AI That should do for now ...

Nice list...just one minor correction.

awesome that is exactly what I am looking for

Man, it's gonna take years to collect the whole set!

isn't there a 50bmg upper that uses a regular ar lower? it is bolt action but not a 1 off if i remember correctly...

Originally Posted By bob332: isn't there a 50bmg upper that uses a regular ar lower? it is bolt action but not a 1 off if i remember correctly...

There are several of them, I have two myself.

Originally Posted By bob332: isn't there a 50bmg upper that uses a regular ar lower? it is bolt action but not a 1 off if i remember correctly...

I was eliminating those as they do not use the standard AR mag well for feeding. If you go that route you can include

50 BMG
416 Barrett
22LR - American 180 style
5.7 x 28 using P90 mags
A pile of others that fit the 50 BMG mags ...

Originally Posted By MartytW: Originally Posted By bob332: isn't there a 50bmg upper that uses a regular ar lower? it is bolt action but not a 1 off if i remember correctly... I was eliminating those as they do not use the standard AR mag well for feeding. If you go that route you can include 50 BMG 416 Barrett 22LR - American 180 style 5.7 x 28 using P90 mags A pile of others that fit the 50 BMG mags ...

Are you talking about the rhineland arms project? I was under the impression that was a no go.

Originally Posted By wesmerc: Originally Posted By MartytW: Originally Posted By bob332: isn't there a 50bmg upper that uses a regular ar lower? it is bolt action but not a 1 off if i remember correctly... I was eliminating those as they do not use the standard AR mag well for feeding. If you go that route you can include 50 BMG 416 Barrett 22LR - American 180 style 5.7 x 28 using P90 mags A pile of others that fit the 50 BMG mags ... Are you talking about the rhineland arms project? I was under the impression that was a no go.

There was discussion about the AR57 platform.
www.ar15.com/forums/topic.html?b=3&f=121&t=375974


In that thread, there's a link (shown below) to the website that is going to sell them.
www.militarygunsupply.com/shop2/index.php?main_page=product_info&cPath=35&products_id=338

Is the 357 Automag the same as a 357 Mag pistol round ? if it is
please say where can I get one !!

Originally Posted By MMcfpd: Man, it's gonna take years to collect the whole set!

Tell me about it!

Need to add:

6.5X243 WSSM

6.5X257 WSSM

The ejection port needs enlarging & the mag followers need to be modified. That & there is no commercial ammo available. This round should be able to duplicate 260 Remington ballistics.

ETA: http://www.dtechsuperstore.com/Wildcat.htm

A friend of mine has build a few "new" Ar platform rifles as well. Here is one in 22-250.

He is going to market this conversion and a few others that use the AR-10 platform.

Originally Posted By pointtarget: Is the 357 Automag the same as a 357 Mag pistol round ? if it is please say where can I get one !!

Nope. 357 AutoMag is (more or less) a .308 Win case cut short and necked to .357. Recall (or Google depending on your age) Dirty Harry using the 44 AutoMag in "Sudden Impact". This same round necked down to .357 gives the .357 AMP (Auto Mag Pistol).

VERY different from the .357 Magnum commonly found in revolvers and other firearms.

so you can use a standard ar15 lower receiver with differnt calibers? im new to AR's and just bought 2 double star receivers. waiting to get them now!!

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