This is a noob question but what uppers can be used on a .223/.556 lower?

You just have to match the receiver to it methinks. i.e. make sure that it is a upper that takes both .223 and .556 .

I'm pretty sure the only snag is that you canNOT match an AR10 (BAR10, etc.) upper with an AR15 lower. However, most of the major brands offer uppers in .223 or .556 that will match their equivalent of the AR10.

I think he is asking about other calibers. I do not have any other caliber uppers, but I think most other calibers out there in the AR upper will work on the .223/5.56 lower, except for the stated above .308 or larger/longer.

6.5 Grendel, 458 Socom, 50 Beowulf, 300 blackout, 6.8 REM, 9mm, 22LR to name a few of MANY

I don't have a list of uppers for the AR15 platform but it is NOT caliber specific such as AR15 platform = lower than .308 and AR10 = .308 and larger.

There are several AR15 platform uppers that are 30 caliber and larger such as the 300 AAC Blackout, 458 Socom, 50 Beowulf etc...

You will have to do some research on exactly what fits what but the best thing to do is figure out what caliber you want and then go from there.

This is from ar15armory.com....


AR-15, without bolt modification
.17 Remington
.17/223
.20 Tactical
.20 Practical
.20 Vartag
.204 Ruger
.221 Fireball
.222 Remington
.222 Remington Magnum
.223 Remington (5.56x45mm)
.223 Remington Ackley Improved
6x45mm
6mm TCU
6x47mm
6mm Whisper
.25x45mm
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 WOA
6mm BR Remington
6mm Hagar
6.5mm PPC
6.5 WSSM
6.5 WOA
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)
7.62x25
7.62x39mm
.30 RAR
300 OSSM
.357 Auto
.35 Gremlin (necked up 6.5 Grendel to 358)
.358 WSSM (various names, but all are some form of a WSSM necked up to 35 caliber, some are shortened to make them big game legal in Indiana)
.458 SOCOM
.50 Action Express
.50 Beowulf

AR-15 using a simple blowback operation
.17 HMR
.22 LR
.22 WMR
9x19mm
9x21
9x23
30 Carbine
357 Sig
40S&W
400 Cor-Bon
41 Action Express
10mm Auto
45 GAP
45ACP
45 Super
45 Win Mag

This list is in no way complete.

This list does not include complete different uppers like the FN 5.7 or the one that shoots .410 shotgun, crossbow bolts or bolt action uppers like the 50BMG

I don't think you can use a .223 lower and make a .50 cal with just a bolt modification. Pretty sure it has to be a AR 10 platform for that?

GLC, I do not know the answer to that question. I just found that list and posted it here.

You can even put a mag fed 50 bmg on it if you want to.

AR15 50 BMG

Wow, that is something else! So I guess the long action / short action part does not mean anything now. Pretty kool!

Double post

OK, that's cool.

I have a 50 Beowulf, uses a 7.62 x 39 bolt, and its on a 5.56 lower, and uses a regular 5.56 mag.

50 cal Beowulf upper pins right on the AR15 lower, and is ready to shoot. Uses standard 223/5.56 magazines as well with a little dremeling on the front edge.

+1

Took me forever to find my post since it was moved... I just want something with some power...

25 wsm

458 SOCOM RAW Power, Max Thumper.

POWER?

Foot pounds of energy or ability for distance and still have energy?

Maybe 100-200 yds and knock a big hog

458 Socom, 50 Beowulf, 300 blackout, 6.8 REM, 9mm, 22LR to name a few of MANY



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450 bushmaster is a decent large bore caliber and bass pro and others usually has them . 458 and 50 Beowulf are good as well but harder to find ammo and it usually cost more . Wish I would have never sold my 450 bushy

What does a upper 450 bush cost?

U can find em as low as 550. Cabelas has a sale on them every year but not sure when it is .

We were shooting an 8x8x1/2" thick steel plate yesterday with various AR calibers.
The 5.56 would make it swing but the 300 Blackout would almost wrap the chain around the pipe it was hanging from!

Cousin bought a 450 Bushmaster Upper from Cabelas at Christmas for 450.00 last year, shot it 5 times and sold it for 500.00.

Sounds like something to look into I just need to get my ar scoped