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 What caliber can be used with the AR15 lower?
MrKasab  [Member]
2/18/2005 3:09:50 AM EST
What are all the rounds that can be shot using a standard AR-15 lower receiver. This is a list of all that I know of, I know I am missing a lot.

5.56mm
9mm
6.8mm
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ARhabit  [Member]
2/18/2005 3:46:51 AM EST
50bmg
762x39
204ruger
22lr
223wssm
243wssm
50beowulf
458socom
6.5grendel
17rem
40sw
10mm
45acp
357sig
MartytW  [Member]
2/18/2005 3:59:26 AM EST
Copied from the following post in AR Discussion AR Calibers Post

Check in the variants board, this same topic comes up every now and then

Pistol calibers
32 ACP - Tromix
9mm x 19 - Various
10mm - various
44 Magnum - Tromix (discontinued)
44 AMP - tromix
45 ACP - various
50AE - various
502 Thunder Sabre - various
22 LR
17 HMR
17 Mach 2

Rifle calibers
Whisper series
223 Rem
204 Ruger
20 Tactical
20 VarTarg
19 Calhoun
17 Remingtom
17 Mach IV
17 Tactical
5/35 SMc (r)
25 x 223
257 Waterfowler (25 x 204 Ruger)
6 x 45
6 TCU
7 x 45
7 TCU
6 x40 (30 Rem based)
6.8 SPC
30 HRT (30 x 6.8 SPC x 42)
30 - 223 (30 Coyote)
223 WSSM
243 WSSM
257 WSSM
308 WSSM (30 Olympic)
7.62x39
22 PPC
6 PPC
6.5 Grendel
7.62x24 (Leitner Wise, 10mm based)
7.62x25 Tokarev
338 Spectre
458 SOCOM
499 LW
50 Beowulf
475 Tremor
7 mm BR
357 Max Rimless


These are all the ones I can remember right now, I am sure I missed some somewhere

Hey, Ed, how about tacking a post about all the various calibers. If I can find some free time, I would even be willing to put together a spreadsheet ....

Marty

MrKasab  [Member]
2/18/2005 7:17:53 AM EST
My guess is all the pistol calibers will use the standard ar lower, but which rifle calibers use the standard ar lower (ex, .308 is too big to fed through the magwell, so a .308 lower is not the standard size).
geronimotn  [Member]
2/18/2005 8:23:17 AM EST
Where could I find an upper in 7 TCU?
It is one of my favorite Contender cartridges.
shullear  [Member]
2/18/2005 8:32:35 AM EST
he said .308 wssm which means winchester super short mag. Also he forgot the 5.45x39.
MartytW  [Member]
2/18/2005 10:36:46 AM EST
All the ones listed in that long laundry list use the standard lower, and most use the standard magazine on top of that. Some require special seating or short bullets, ie the .30-223 will require use of the lighter, shorter bullets to allow use of the standard magazine.

Indeed, I forgot the 5.45x39 .... There are probably a few others I forgot

7 TCU, have an AR smith build one for you. But as with the 30-223, this cartridge will require you to either single load or else use short, stubby bullets seated deep ....

Marty
RidgeRunner  [Member]
2/18/2005 3:20:42 PM EST
its like this, the 22-250 is too long anything shorter will work, if it'll go down the magwell someone will build it
RR
ARnut223  [Member]
2/19/2005 8:57:47 PM EST
I was thinking an AR in 5.7x28 along with an FNH five-seven handgun would be an awsome combo.

Randy
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