If I get a .556 lower does this mean I’m stuck with that caliber?

[Diesel6393]

Or can I put any .556 family upper on?

 

[AJK129]

.556 will either be tiny, or illegal

But typo aside, yes you're good assuming its not an NFA item

 

[01bmf]

Nope. Not stuck. But not just ANY upper. Way too in depth question for one post. But no, you are not stuck with 5.56.

 

[Diesel6393]

.556 will either be tiny, or illegal

But typo aside, yes you're good assuming its not an NFA item

Uggg hahaha ...... still to early in the am sorry guys just had our third kiddo brain is not all their rite now

 

[Diesel6393]

Nope. Not stuck. But not just ANY upper. Way too in depth question for one post. But no, you are not stuck with 5.56.

Thanks I just finished two multi cal lowers into two SBR’S and I just found another lower but it says 556 on it and I have not looked into reasons why I could not buy the lower and do say a 22 upper for it sounds weird maybe but I’m trying to build on for my wife and I wanna start her with a 22 but then get her into doing a 224 wylde later on and I don’t want a bolt conversion for the 22

 

[SKumar]

In a single 556 lower, I shoot THREE calibers:
-556
-9mm (with torkmag adapter)
-22lr (with CMMG bcg conversion)

So no, you're not stuck with one caliber.

 

[greencobra]

follow your heart, grasshopper...

 

[Diesel6393]

In a single 556 lower, I shoot THREE calibers:
-556
-9mm (with torkmag adapter)
-22lr (with CMMG bcg conversion)

So no, you're not stuck with one caliber.

Thanks

 

[76Too]

And don’t forget about 6.5 grendel, 300 BLK, 7.62x39, 450 bushmaster and .458 SOCOM!

 

[LuvDog]

I don't even pay attention to the caliber marking on the lower (well except my AR10 lower)

 

[Diesel6393]

And don’t forget about 6.5 grendel, 450 bushmaster and .458 SOCOM!

Wait you can do 6.5 one ar-15 platform sorry I’m new to all this as of end of last year just built my first two SBR’S

 

[76Too]

6.5 grendel upper will fit a 5.56 lower/yes.

6.5 creedmoor will require a .308 (AR10) style lower (same diameter projectiles, but larger cartridges).

 

[ENGLAND]

You would be stuck if you tried to run that 5.56 in a .223

 

[paul73]

-22lr (with CMMG bcg conversion)
So no, you're not stuck with one caliber.

what ammo brands you found to cycle the CMMG well?

 

[paul73]

6.5 grendel upper will fit a 5.56 lower/yes.

6.5 creedmoor will require a .308 (AR10) style lower (same diameter projectiles, but larger cartridges).

i would go with 300blk, not 6.5grendell.
anyway:

What Are the AR-15 Cartridge Choices:​

• .204 Ruger
• .223 Remington
• .22 Nosler
• .224 Valkyrie
• .25-45 Sharps
• 6.5 Grendel
• 6.8 SPC
• .300 Blackout
• .300 Ham’r
• .30 Remington AR
• .350 Legend
• .450 Bushmaster

 

[Diesel6393]

i would go with 300blk, not 6.5grendell.

Just built a 8.5” criterion 300 love it not the price per round tho

 

[SKumar]

what ammo brands you found to cycle the CMMG well?

Anything copper head cycles best. I found if the polymer/lead bullet is old, the residue will cause the round to half feed. Generally speaking, it'll take just about any brand.

 

[76Too]

Just built a 8.5” criterion 300 love it not the price per round tho

It’s very cheap to reload/cast for if you want two more time consuming hobbies?

 

[paul73]

Just built a 8.5” criterion 300 love it not the price per round tho

i kinda play with the idea to make an upper for a soviet 7.62×39 round, but, not sure if it is really worth the time.
a 300blk i would want to do as well, i want it - but prices and availability of 300blk now are both insane. so, it will wait.

 

[MGnoob]

If you run the 22 conversion it’s direct blow back. Meaning every so often you should take the conversion out and shoot .223/5.56 through it. Keep your gas tube and gas block from getting filled with lead and copper shavings.

 

[Diesel6393]

i kinda play with the idea to make an upper for a soviet 7.62×39 round, but, not sure if it is really worth the time.
a 300blk i would want to do as well, i want it - but prices and availability of 300blk now are both insane. so, it will wait.

Yes I hear you on that I did not wait because I wanted to get my SBR done ASAP along with my 12.5” wylde

 

[paul73]

Anything copper head cycles best. I found if the polymer bullet is old, the residue will cause the round to half feed. Generally speaking, it'll take just about any brand.

i was looking back and forth at it and got a CZ varmint which is nothing short of amazing accuracy wise, but, still tempted to go the CMMG way also. thx for the confirmation.
a conversion kit in the G17 is pretty sensitive - only works well with blazers and cci mags, pretty much. anything else including aguila se is not cutting it.

 

[Diesel6393]

If you run the 22 conversion it’s direct blow back. Meaning every so often you should take the conversion out and shoot .223/5.56 through it. Keep your gas tube and gas block from getting filled with lead and copper shavings.

That’s why I just wanna make a 22 upper only

 

[MGnoob]

It’s really not that big of a deal. I burn thousands upon thousands of rounds of 22 through my .22 conversion...There’s no real issues until you’re putting it in and putting it out of time...It’s quite accurate as well

 

[paul73]

It’s really not that big of a deal. I burn thousands upon thousands of rounds of 22 through my .22 conversion...There’s no real issues until you’re putting it in and putting it out of time...It’s quite accurate as well

i did shoot norma rounds from CZ at 100yds when i zeroed it - spent about 30 rounds, it formed a very tight 1.2" hole. no fliers, no misses, most rounds went into a 0.4" center. that was with an 11moa drop.
amazing rifle. at 25yds it places your shots into same hole. kids love it, it is a great feel to see how shot actually goes where you aim it at.

 

[xtry51]

When they come back in stock, these are great. We have two and they get used a lot.

Brownells - Serious about firearms

The CMMG Bravo AR-15 .22LR Conversion Kit allows you to practice your critical shooting skills while using economical .22LR ammunition.

www.brownells.com

 

[01bmf]

That’s why I just wanna make a 22 upper only

I agree that a dedicated .22lr upper is the way to go. If it's just a range toy and you aren't trying to squeeze every last bit of performance out of it, they can be quite inexpensive.

 

[paul73]

When they come back in stock, these are great. We have two and they get used a lot.

Brownells - Serious about firearms

The CMMG Bravo AR-15 .22LR Conversion Kit allows you to practice your critical shooting skills while using economical .22LR ammunition.

www.brownells.com

they say - "Works best with round-style AR-15 hammers; notched hammers can cause function problems."
is the problem real? as i got a 3lb pull larue trigger i love, not going to alter that, but, it is notched.

 

[NavelOfficer]

Don't forget the .277 Wolverine...

.277 Wolverine

The .277 Wolverine (277 WLV) was designed to effectively utilize abundant 5.56 cases and 6.8 (.277) projectiles in various weights. It combines excellent performance with versatility by using all...

www.maddogweapons.com

 

[highlander]

I've 2 dedicated 22 uppers never had any problems with them and I've used sub sonic,standard and copper plated.