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View Full Version : AR conversion calibers?


ReddingShooter
09-20-2008, 12:05 PM
i was thinking this morning that id like to covert one of my OLL guns to something other than 223 or 5.56

now i know that there are several calibers available, but im not to knowlegable in what one has to do to convert. ive seen 300, 7.62x39,204,6.8mm SPC ( the one im thinkin about) and a few others


if i wanted to convert, would i have to change the whole upper, or just the barrel and bolt?

any info on what calibers can be used with the stock upper would be greatly appreciated

fusionstar
09-20-2008, 12:21 PM
I believe you would need the whole upper including bolt assembly. I still don't have a ar so I cant say exactly. You would need to headspace your rifle if you do change the barrel and I would rather pop 2 pins and have a new rifle in 30 seconds than 3 hours fiddling around with a new barrel, gas, spring adjustments so forth..

I believe ANY round that can fit into a standard AR magazine can be chambered in a standard ar-15 Lower. It would have to have a custom upper assembly to cycle of course..

You'll still need a new magazine designed for the caliber chosen because ar-15 magazines were designed for 5.56/223 and might not work well with other calibers.

Bowser
09-20-2008, 12:47 PM
9mm

Bimmer2
09-20-2008, 1:02 PM
Yes, you'll need a complete upper, unless you're going to get a .22lr conversion kit.

If for some reason you really want a rifle that shoots something other than 5.56, then what's the reason? How can anybody tell you what caliber to buy if you don't say why you're unhappy with 5.56?

If you're just bored, then go shooting or go watch TV or something.

Ben

shark92651
09-20-2008, 1:04 PM
9mm

We've just recently gotten into the 9mm AR conversions ourselves. Here are the uppers and lower parts needed for the RRA 9mm rifles.

http://riflegear.com/c-52-9mm-uppers.aspx

Bimmer2
09-20-2008, 1:13 PM
Here are the uppers and lower parts needed for the RRA 9mm rifles.[/url]

Wow! Over $700, plus tax and shipping, to convert to 9mm...

I don't doubt that these are fair prices, I'm just wondering why anybody would convert an AR instead of just buying another one.

Ben

What Just Happened?
09-20-2008, 1:15 PM
Well, just get another lower and a new stock and you have another AR.

shark92651
09-20-2008, 1:57 PM
Wow! Over $700, plus tax and shipping, to convert to 9mm...

I don't doubt that these are fair prices, I'm just wondering why anybody would convert an AR instead of just buying another one.

Ben

Yeah, and RRA makes a dedicated lower receiver that doesn't require the magazine block. Still, the price difference between a couple thousand rounds of 9mm ammo vs .223 ammo would pay for that $700.00. A dedicated .22LR upper is cheaper, and the ammo is WAY cheaper. Most of the other AR calibers are gonna have more expensive ammo unless you reload.

Bimmer2
09-20-2008, 7:33 PM
Still, the price difference between a couple thousand rounds of 9mm ammo vs .223 ammo would pay for that $700.00

Huh? I buy 5.56 for $420/1,000 rounds, including shipping, and that's Lake City, not PPU or Wolf.
Unless you're giving away 9mm, it's going to take a lot more than a couple thousand rounds to amortize a $700.- 9mm kit.

I figure a $200.- .22lr kit, even shooting Mini-Mags, will have paid for itself after 600 rounds...

Ben

JeffM
09-20-2008, 8:01 PM
Huh? I buy 5.56 for $420/1,000 rounds, including shipping, and that's Lake City, not PPU or Wolf.
Unless you're giving away 9mm, it's going to take a lot more than a couple thousand rounds to amortize a $700.- 9mm kit.

I figure a $200.- .22lr kit, even shooting Mini-Mags, will have paid for itself after 600 rounds...

Ben

At that price it's a $200/k difference. Shoot 4k rounds of 9mm and you're $100 ahead.

JeffM
09-20-2008, 8:03 PM
Oh, don't forget the .50BMG (for reg'd AW receivers) and variants. BOOOOOOOMMM!!! :D

ReddingShooter
09-21-2008, 5:00 AM
i dont have anything against 223/5.56 i have several guns chamered in that caliber. thats why id like to ave something caliber wise to play with

Regulus
09-21-2008, 6:20 AM
i dont have anything against 223/5.56 i have several guns chamered in that caliber. thats why id like to ave something caliber wise to play with

If by 'wise' and by 'play with' you mean cost effective, you should seriously consider a .22LR conversion or a dedicated .22LR upper. Picking up my Spikes .22LR SD tomorrow and already bought the ammo (1100 rounds for $29.00... priceless). If you are indeed in Redding, you might call JK Supply first (to support them) and see what they can get for you. Here's a few sites to visit:

http://www.jksupplyco.com/index.html
http://www.brownells.com/aspx/ns/store/catsearch.aspx?c=2444&p=4816
http://www.lanworldinc.com/Uppers.html

ReddingShooter
09-21-2008, 11:59 AM
i already HAVE a dedicated 22lr upper, AND an AR-15 pattern 22lr.


im not interested in 9MM......

im not even in the SLIGHTEST bit worried about "cost effective" . i reload my own ammo, and buy powder by the 8lb keg.

im interested in calibers that are compatible with the AR upper itself. i do realize that id have to buy a bolt to match the caliber, im not worried about that either.

aplinker
09-21-2008, 1:27 PM
i already HAVE a dedicated 22lr upper, AND an AR-15 pattern 22lr.


im not interested in 9MM......

im not even in the SLIGHTEST bit worried about "cost effective" . i reload my own ammo, and buy powder by the 8lb keg.

im interested in calibers that are compatible with the AR upper itself. i do realize that id have to buy a bolt to match the caliber, im not worried about that either.

Removing the barrel from an upper is not a good idea, as repeatedly doing so will put too much stress on the parts.

At minimum you would need an upper, barrel and bolt, with the barrel/upper mated.

I copied this list from somewhere a while ago...

AR-15, without bolt modification
.17 Remington
.20 Tactical
.204 Ruger
.221 Fireball
.222 Remington
.222 Remington Magnum
.223 Remington (5.56x45mm)
.223 Remington Ackley Improved
6x45mm
6mm Whisper
6.5mm Whisper
7mm Whisper
7mm TCU
.300 Whisper (.300/221, .300 Fireball)
.338 Whisper

AR-15, with bolt modification
223 WSSM
5.45x39mm (.21 Genghis)
243 WSSM
6mm PPC
6mm BR Remington
6.5mm PPC
6.5mm Grendel
25 WSSM
6.8x43mm SPC
.30 Herrett Rimless Tactical (6.8x43mm case trimmed to 41mm and necked up to .308; the 6.8mm version of the .300 Whisper)
7.62x39mm
.357 Auto
.458 SOCOM
.50 Action Express
.50 Beowulf

AR-15 using a simple blowback operation
.17 HMR
.22 LR
.22 WMR
9x19mm
40S&W
10mm Auto
45ACP

Some are harder/easier than others and/or more readily available.

If you don't want it to use the magazine and/or be semi-auto you could use jsut about any caliber.

ar15barrels
09-21-2008, 1:47 PM
RRA makes a dedicated lower receiver that doesn't require the magazine block.

Have you found these to be available yet?
It sure seems like the best way to go vs. all the conversion blocks we have been using for years.
Might have to get one of the 80% lowers without the magwell and do one for myself as a pistol.

ReddingShooter
09-21-2008, 2:04 PM
WOW 8)

50AE?

id love to have an AR barreled in 50AE

now here comes the questions


would it be DIFFERENT (I.E. made specifically for the 50AE) upper, or will a standard 5.56 AR upper work without mods? ( upper meaning the actual UPPER that mates with the lower, not the barrel,etc)

were would one get AHOLD of a 50AE barrel and bolt?

if i could find one, id be all over it like white on rice.

ar15barrels
09-21-2008, 2:24 PM
id love to have an AR barreled in 50AE

now here comes the questions

would it be DIFFERENT (I.E. made specifically for the 50AE) upper, or will a standard 5.56 AR upper work without mods? ( upper meaning the actual UPPER that mates with the lower, not the barrel,etc)

Recievers are the same, but they get extended feedramps blended into them.
I got an offer a few years ago to buy up the remaining stock of 50 AE barrels and uppers from the guy that was making them.
I declined because there was not much demand.

I don't think anyone is making them anymore, but they pop up used from time to time.
Just keep watching the auction sites and the arfcom ee and you will find one eventually.

50 Beowulf is easily available though.
It's just a lengthened 50 AE with a different sized case head.

X-NewYawker
09-21-2008, 3:03 PM
MGI makes gun with interchangeable mag wells in 5.56. 7.63X39. 45 ACP --
http://i125.photobucket.com/albums/p54/Fasanoland/Marineand4AR.jpg
and a bunch of others.

shark92651
09-21-2008, 6:03 PM
Have you found these to be available yet?
It sure seems like the best way to go vs. all the conversion blocks we have been using for years.
Might have to get one of the 80% lowers without the magwell and do one for myself as a pistol.

I'm not sure but they are in the catalog and online.

http://www.rockriverarms.com/index.cfm?fuseaction=category.display&category_id=241&CFID=18777855&CFTOKEN=32716902

ar15barrels
09-21-2008, 6:10 PM
I'm not sure but they are in the catalog and online.

http://www.rockriverarms.com/index.cfm?fuseaction=category.display&category_id=241&CFID=18777855&CFTOKEN=32716902

RRA puts a lot of things on their website.
I was wondering if you had actually seen them through your shop yet.
LAR-8's were on the website for 2+ years before one existed in CA.

aplinker
09-21-2008, 10:58 PM
Magwells cost a fortune... it's a shame, too.

MGI makes gun with interchangeable mag wells in 5.56. 7.63X39. 45 ACP --
http://i125.photobucket.com/albums/p54/Fasanoland/Marineand4AR.jpg
and a bunch of others.

redmantis3
09-22-2008, 12:39 PM
Still new here and a complete newbie to builds. I would like to ask for some help & input from those with experience.

What would I need to do a 10mm build like Olympic Arms K-10? I'd prefer a final product that could be compatible with Glock 20 mags.

All help is appriciated.

Steve

aplinker
09-22-2008, 10:44 PM
Still new here and a complete newbie to builds. I would like to ask for some help & input from those with experience.

What would I need to do a 10mm build like Olympic Arms K-10? I'd prefer a final product that could be compatible with Glock 20 mags.

All help is appriciated.

Steve

I would buy the K-10... apparently the Oly K-10 lowers are off-list. I'm not aware that of any commercial mag block like that - you would need to make your own.

randy
09-23-2008, 12:56 AM
If it were me I'd try the 6.8. Flatter shooting, more energy down range, and I think it is legal to hunt deer with that caliber. There are a couple of companies making uppers for it.

I don't know enough about the 50 beowolf but you might look into that too.

The pistol caliber stuff in an AR platform just doesn't do it for me at all. If you want to a shoot pistol caliber then buy a pistol.

DrunkSkunk
09-23-2008, 1:01 AM
RRA puts a lot of things on their website.
I was wondering if you had actually seen them through your shop yet.
LAR-8's were on the website for 2+ years before one existed in CA.

Existed or existed in california?

ar15barrels
09-23-2008, 6:58 AM
Existed or existed in california?

both.

ReddingShooter
09-24-2008, 5:19 AM
If it were me I'd try the 6.8. Flatter shooting, more energy down range, and I think it is legal to hunt deer with that caliber. There are a couple of companies making uppers for it.

I don't know enough about the 50 beowolf but you might look into that too.

The pistol caliber stuff in an AR platform just doesn't do it for me at all. If you want to a shoot pistol caliber then buy a pistol.


i was thinkin about the 6.8 SPC

looks like a nasty round

im the same about the pistol caliber stuff.

fevillago
09-24-2008, 9:24 PM
Yeah, and RRA makes a dedicated lower receiver that doesn't require the magazine block. Still, the price difference between a couple thousand rounds of 9mm ammo vs .223 ammo would pay for that $700.00. A dedicated .22LR upper is cheaper, and the ammo is WAY cheaper. Most of the other AR calibers are gonna have more expensive ammo unless you reload.

when are you getting 22LR uppers in your store?

fevillago

joelogic
09-24-2008, 9:58 PM
Anyone have a link for a .17 upper?

joelogic
09-24-2008, 10:00 PM
Oly Arms made one and cheaper than dirt had one.

http://www.cheaperthandirt.com/ARR057-1.html