View Full Version : AR-15 caliber list

September 20, 2008, 10:08 PM
How about an AR-15 caliber listing challenge?

I'm going to ask each person who reads the thread to add a post with one single factory caliber which is available for the AR-15 and the trade name of an AR or upper in that caliber.

Please don't repeat calibers that were already mentioned or list a bunch of calibers in your post.

It's OK to count military and civilian calibers as 2 different ones (but please only list one in your post) and its OK to include single shot factory uppers. But no wildcat uppers please unless you know a factory which makes them. For the oddball calibers weblinks would be appreciated.

I'll go first with my favorite:

6.5mm Grendel, rifles made by Alexander Arms.

September 20, 2008, 10:48 PM
450 thumper - Bushmaster

Double Naught Spy
September 21, 2008, 05:08 AM
Beowulf .50, Alexander Arms http://www.alexanderarms.com/beowulf.htm

September 21, 2008, 08:07 AM
6.8 Remington SPC - Model 1, + lots of others, etc.

September 21, 2008, 09:40 AM
Here's a couple from SSK industries?

300 Whisper
7mm TCU

Plus several others that are interesting.

September 21, 2008, 11:44 AM
is really wanna build one for 500 to 600 yrd fun

.308 win

September 21, 2008, 11:51 AM
.308 win

.308 is an AR10 rifle. The OP wants AR-15 calibers.

.204 Ruger, JP enterprises, among others.

September 21, 2008, 12:06 PM
uhmm..223/556 NATO.. From Colt. I wonder if anyone thought of that one. :D

September 21, 2008, 01:41 PM
Duhh... .223 Remington

September 21, 2008, 07:35 PM
Too many too list. There must be at least three dozen calibers available in the Ar15.

.22LR; Spike's tactical. Maybe a few others.

9mm; RRA, CMMG etc.

Rant Casey
September 21, 2008, 07:44 PM
458 socom
.50 bmg (bohica etc..)

September 21, 2008, 08:16 PM
5.45x39mm smith&wesson

September 21, 2008, 10:19 PM
.308 win dpmsOK, for this game we only give credit if you can find a manufacturer of single shot .308 uppers for the AR-15. As Arabia says, the semiauto platform for .308 is the AR-10. The AR-10 has a longer magazine well than the AR-15.

For my next round I'm going to mention .338 Lapua, which is found in a Bohica Arms single shot upper.

September 22, 2008, 08:19 AM
DPMS makes a 6.5 Creedmoor.

September 22, 2008, 10:56 AM
DPMS makes a 6.5 Creedmoor

6.5 Creedmoor, .300RUm, .243Win, .338Fed and the .260Rem DPMS uppers are for the AR10, not the AR15. They won't work on a AR-15 lower. We are discussing AR-15 caliber conversion uppers.

Here's another Ar-15 upper
7.62x39mm: DPMS

September 22, 2008, 11:07 AM
Olympic Arms

September 22, 2008, 09:12 PM
.40S&W & 10mm. Olympic arms.

September 22, 2008, 11:22 PM
there is a 50 BMG upper for the Ar15. I want 7 of them

Mach II Sailor
September 23, 2008, 08:06 AM
.499 LWR - LWRC, the biggest caliber and OAL cartridge for the unmodified lower !!

September 23, 2008, 01:25 PM
20 Practical, by Weaver Rifles:)


I want one when available this fall.


Cpl. B
September 27, 2008, 12:25 AM

September 27, 2008, 12:31 AM
dont forget .22lr lol
Damn just saw someone already said this hmmm I dunno looks like most have been covered.

September 27, 2008, 01:08 AM
what about the wssm calibers? is that still an ar 15 standard lower?

sorry, i dont know beans about those wssm rounds, i just remember seeing someone makes an ar in the 243wssm. i cant for the life of me remember where i saw it though...

September 27, 2008, 10:11 AM
So far so good. I don't vouch for the accuracy of this list but this is what I counted so far, though some of the entries are difficult to find on the internet. Who has links? We can only count the .308 series and WSSM calibers if you can name a manufacturer. Sorry.

.20 Practical - Weaver Rifles
22LR - Spikes Tactical
5.45x39 - Smith and Wesson
.223 - Remington- DPMS (one maker added by me as common knowledge- there are probably 50 other makers)
5.56mm NATO - Colt
6.5mm Grendel - Alexander Arms
6.8 Remington SPC - Model 1 (Is this the maker or seller?)
7mm TCU - SSK Industries
.300 Whisper - SSK Industries
.338 Lapua - Bohica Arms
.40 S&W - Olympic Arms
10mm - Olympic Arms
.45 ACP - Olympic Arms
.450 "Thumper" (Is that a proper name?') - Bushmaster
.458 Socom (Made by who? Socom?)
.499 LWR - LWRC
.50 Beowulf - Alexander Arms
.50 BMG - Bohica Arms

September 27, 2008, 10:47 AM
found the wssm rifle. its olympic arms.


Rant Casey
September 27, 2008, 11:56 AM
MeekandMild - there is a .458 socom by RRA and through tromix as well. http://www.tromix.com/Tromix_458.htm

September 27, 2008, 12:16 PM

September 27, 2008, 12:37 PM
6x45mm by High Standard.

September 29, 2008, 09:18 PM
OK, who makes the 9mm?

.20 Practical - Weaver Rifles
22LR - Spikes Tactical
5.45x39 - Smith and Wesson
.222 Remington - Colt
.223 - Remington- DPMS (one maker added by me as common knowledge- there are probably 50 other makers)
5.56mm NATO - Colt
WSSM .223 - Olympic Arms
WSSM .243 - Olympic Arms
6x45mm by High Standard
WSSM .25 - Olympic Arms
6.5mm Grendel - Alexander Arms
6.8 Remington SPC - AR15 Performance - see Barber 2678's and Globmaster3's notes
7mm TCU - SSK Industries
.300 Whisper - SSK Industries
.338 Lapua - Bohica Arms
.40 S&W - Olympic Arms
10mm - Olympic Arms
.45 ACP - Olympic Arms
.450 "Thumper" (Is that a proper name?') - Bushmaster
.458 Socom - RRA or Tromix
.499 LWR - LWRC
.50 Beowulf - Alexander Arms
.50 BMG - Bohica Arms

September 29, 2008, 11:00 PM
.222 Remington ARs were produced by Colt, and I think there are some other manufacturers that still make them. They evidently are popular in foreign markets where civilians cannot own weapons in "military" calibers.


September 29, 2008, 11:28 PM
Anyone selling the 5.45 other than directly from S&W? I'm really wanting one if the price can work for me.

September 30, 2008, 02:18 PM
AR15 Performance should get the credit on the 6.8 SPC (not 6.8 Remington SPC). Model 1 Sales is low end stuff and has not performed any development.

September 30, 2008, 11:05 PM
Model 1 is just a manufacturer (or assembler if you rather) of uppers in 6.8 as well as J&T Distributing, CMMG, and a couple others. Who created it? Don't know. I thought the OP was looking for suppliers based on
trade name of an AR or upper in that caliber.

However, to counter Barber's barb (pun intended) 6.8 SPC/6.8 Remington SPC, come on! Google it and what do you find? Even look at the website dedicated to it http://www.68spc.com/ and what's in the title line? 6.8 Remington SPC.

March 14, 2011, 08:18 AM
6.8 spc-BARRET

March 14, 2011, 10:50 AM
.410 gauge, American Tactical Imports


RRA also makes a 9mm AR upper.


March 14, 2011, 11:19 PM
Forgot one 7.62x25.

March 15, 2011, 12:23 AM
a Cal .30 Carbine upper for the AR-15???
Think they had an adapter that fitted the LR mag well for using the M1 Carbine magazines???

Wuld mind find one of those!!!

March 15, 2011, 06:21 AM
Forgot to go smaller than .22lr


H.W. French
March 15, 2011, 11:24 AM

March 15, 2011, 01:27 PM
300 Blackout AAC, Noveske, Wilson, YHM and others. ;) I know, the 300 Whisper has already been mentioned.......:p

June 25, 2011, 04:53 PM
5.7x28mm AR-57 uppers

June 25, 2011, 05:12 PM
308 Win.


June 25, 2011, 05:27 PM
What no one's listed the 204 -DPMS


June 25, 2011, 06:23 PM
204 was brand new back in 2008 when this thread started.

I think its time for a new thread with some updated info.

June 25, 2011, 09:16 PM