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View Full Version : What to do with this 5.56 ammo???


Nate74
05-28-2009, 3:20 PM
In my excitement at finding what I thought was a great deal, I bought a 1000 rounds of PRVI 5.56. Now I'm reading that maybe I should not be firing it through my AR that's chambered in .223.

So I have some choices and since I'm bored to tears at work right now, I thought I'd throw 'em out.

- find a barrel chambered in 5.56 for my AR
- sell the PRVI 5.56 or try to trade it for .223
- save it for shooting in my Mini-14 which I've read is OK to shoot it

Pros/cons? Anything to keep me busy until 5pm? ;) Thanks.

jumbopanda
05-28-2009, 3:21 PM
Get a real AR that's chambered in 5.56!

aplinker
05-28-2009, 3:22 PM
Shoot in the AR you have & watch for signs of overpressure (primers coming loose, etc.).

I'm betting it will be fine.

evan69
05-28-2009, 3:23 PM
I'm sure SOME calgunner has 1000 in .223 and could trade you...

OofieXD
05-28-2009, 3:24 PM
Ooooh, I have 1k rounds of PRVI in .223 62gr. If you were only closer, we can trade.

Dirtbiker
05-28-2009, 3:26 PM
What kind of AR do you have that is chambered in 223?

-hanko
05-28-2009, 3:27 PM
Shoot in the AR you have & watch for signs of overpressure (primers coming loose, etc.).

I'm betting it will be fine.
+1. Shoot it, definitely.

Not gonna' be an issue unless (and a remote chance at that) privi uses very heavy bullets (>75gr or so).

-hanko

Richie Caketown
05-28-2009, 3:27 PM
if that ammo is too much for your barrel you can donate it to me (ill do the gentleman thing and pay for shipping) and ill shoot it through my AR so you dont damage yours

Justintoxicated
05-28-2009, 3:30 PM
I have plenty of PMC bronze 223 to trade if you want some or all of it. Then you don't have to worry. I would only shoot .223 through it as well if that is what it is chambered for.
I also have Centurion 223 on the way too.
I'm in Long Beach if you wanted to trade, mine is chambered for 5.56.

Nate74
05-28-2009, 3:38 PM
Justintoxicated - I work in Seal Beach so we may be talking soon!

Here's a link to the AR I bought recently from a fellow Calgunner.

http://www.calguns.net/calgunforum/showthread.php?t=172225

Thanks all for your input!!!

lawaia
05-28-2009, 3:50 PM
I believe CMMG uppers are chambered 5.56.

I also have doubts about the 1/9 twist rate stated by the seller of your weapon. CMMG are typically either 1/7 or 1/8.

Either look under the handguards, or call CMMG.

You should be GTG.

Of course, this is all just my opinion, so check it out.

aplinker
05-28-2009, 3:51 PM
Nate,

There's no reason for you to worry. Modern guns like an AR, even chambered in ".223" will have no problem with 5.56. In fact, most ARs sold/marked as being 5.56 are really .223.

Just shoot it.

Dirtbiker
05-28-2009, 3:55 PM
Shoot what you bought. Your CMMG is good to go!

CHS
05-28-2009, 4:06 PM
If it's truly a CMMG upper/barrel, the barrel will be properly stamped with twist-rate and chamber.

Check the barrel under the handguards. Do you see something like "1/7 5.56 CM" or anything similar?

l_Z_l
05-28-2009, 4:07 PM
u shouldn't have any probs shooting it through a cmmg upper..

jasonnorcal
05-28-2009, 4:21 PM
Shoot it at your own risk. It has a higher pressure. You probably won't have problems, but I wouldn't risk it. Especially since so many people are willing to trade you. There is a difference between .223 and 5.56

Nate74
05-28-2009, 4:22 PM
If it's truly a CMMG upper/barrel, the barrel will be properly stamped with twist-rate and chamber.

Check the barrel under the handguards. Do you see something like "1/7 5.56 CM" or anything similar?

I'll check the stamp when I get home.

Again everybody, thanks for the input and advice! I love this place...

aplinker
05-28-2009, 4:31 PM
Shoot it at your own risk. It has a higher pressure. You probably won't have problems, but I wouldn't risk it. Especially since so many people are willing to trade you. There is a difference between .223 and 5.56

myth

Just because it's labeled 5.56 doesn't mean anything about the pressure. It could be higher pressure, but it's just as likely it's not.

The chamber difference is really in the throat... there's just a bit more distance before the bullet engages the rifling.

Nate74
05-28-2009, 4:45 PM
I keep reading that the "increased pressure" comes from that extra distance before the bullet engages the rifling. Of course for every "DON'T DO IT" post I've found, I find at least one "DON'T WORRY" post.

I'm really hoping that I'll find a 5.56 on my upper when I get home...

Joe
05-28-2009, 4:49 PM
another vote for the "shoot it" group.

Beelzy
05-28-2009, 4:52 PM
+1 for shooting it.

aplinker
05-28-2009, 5:02 PM
I keep reading that the "increased pressure" comes from that extra distance before the bullet engages the rifling. Of course for every "DON'T DO IT" post I've found, I find at least one "DON'T WORRY" post.

I'm really hoping that I'll find a 5.56 on my upper when I get home...

Other way around... that it engages the rifling sooner means the pressure increases.

rabidmonk
05-28-2009, 5:11 PM
Here's an interesting read I found on the .223 vs. 5.56. Sorry if it's a repost:

http://www.winchester.com/lawenforcement/news/newsview.aspx?storyid=11

Lateralus
05-28-2009, 5:17 PM
If it's truly a CMMG upper/barrel, the barrel will be properly stamped with twist-rate and chamber.

Check the barrel under the handguards. Do you see something like "1/7 5.56 CM" or anything similar?

I think its CMMG MP 1/7 5.56

Everything CMMG makes is 1/7 5.56 chrome lined. Shoot it to your hearts content if it is stamped CMMG:D

givens
05-28-2009, 5:26 PM
:Ivan::Ivan:

B Strong
05-28-2009, 5:26 PM
Justintoxicated - I work in Seal Beach so we may be talking soon!

Here's a link to the AR I bought recently from a fellow Calgunner.

http://www.calguns.net/calgunforum/showthread.php?t=172225

Thanks all for your input!!!

Your CMMG upper should be fine with the 5.56.

Check the first fired cases for signs of overpressure, discontinue use if the primers are falling out or the cases split, and otherwise enjoy yourself.

aplinker
05-28-2009, 5:29 PM
Your CMMG upper should be fine with the 5.56.

Check the first fired cases for signs of overpressure, discontinue use if the primers are falling out or the cases split, and otherwise enjoy yourself.

Can I just point out this is great advice in general and something everyone should always be doing with any new ammo and/or a bit on every range trip.

CHS
05-28-2009, 5:30 PM
I think its CMMG MP 1/7 5.56

Everything CMMG makes is 1/7 5.56 chrome lined. Shoot it to your hearts content if it is stamped CMMG:D

Yeah, I think you're right. I didn't bring mine to work today so I couldn't check it and get the exact markings :)

B Strong
05-28-2009, 5:31 PM
Can I just point out this is great advice in general and something everyone should always be doing with any new ammo and/or a bit on every range trip.


Learned it the hard way with Paragon bulk 7.62 NATO back in the old days.

aplinker
05-28-2009, 5:46 PM
I think its CMMG MP 1/7 5.56

Everything CMMG makes is 1/7 5.56 chrome lined. Shoot it to your hearts content if it is stamped CMMG:D

except when they're not... ;)

like their 1/8's, 1/12's and SS barrels.

Nate74
05-28-2009, 5:56 PM
Well I rushed home, ripped open my safe and oh... the barrel is marked: DTI 1x9 5.56 NATO Nowhere on it does it say CMMG, so maybe the upper receiver is CMMG?

So one mystery solved (I can indeed shoot my 5.56 ammo) but now a new mystery. What's a DTI barrel?

CHS
05-28-2009, 5:58 PM
Well I rushed home, ripped open my safe and oh... the barrel is marked: 1x9 5.56 NATO DTI Nowhere on it does it say CMMG, so maybe the upper receiver is CMMG?

So one mystery solved (I can indeed shoot my 5.56 ammo) but now a new mystery. What's a DTI barrel?

Looks like Del-Ton:

http://www.del-ton.com/AR_15_Barrels_s/3.htm

Nate74
05-28-2009, 5:59 PM
Yup. I'd say you're right. Interesting...

aplinker
05-28-2009, 6:06 PM
Could be the actual receiver is CMMG, but the barrel is not. CMMG doesn't make a 1/9 barrel that I'm aware of. Of course the markings are DTI, so it's clearly a Del-Ton barrel.

domokun
05-28-2009, 7:45 PM
Well I rushed home, ripped open my safe and oh... the barrel is marked: DTI 1x9 5.56 NATO Nowhere on it does it say CMMG, so maybe the upper receiver is CMMG?

So one mystery solved (I can indeed shoot my 5.56 ammo) but now a new mystery. What's a DTI barrel?

It's 5.56 so you're good to go! :D

sharper1106
06-08-2009, 3:19 PM
just buy a new barrel thats a 5.56, i just got one from midway for 145.00, the ammo cost alot more then that so just change the barrel and sell your old one. you can prolly sell your old one and get most of the funds for your new 1

gemini1
06-08-2009, 3:33 PM
Could be the actual receiver is CMMG, but the barrel is not. CMMG doesn't make a 1/9 barrel that I'm aware of. Of course the markings are DTI, so it's clearly a Del-Ton barrel.


+1. The upper is prolly CMMG with a delton barrel. Shoot the damned 5.56! you should be GTG.

DREADNOUGHT78
06-08-2009, 3:48 PM
just buy a new barrel thats a 5.56, i just got one from midway for 145.00, the ammo cost alot more then that so just change the barrel and sell your old one. you can prolly sell your old one and get most of the funds for your new 1

They had them in stock????

THT
06-08-2009, 5:25 PM
I'd be happy to dispose of that meddlesome 5.56 for you. I won't charge you a fee and I'll even split the shipping costs with you :D

sharper1106
07-31-2009, 7:51 PM
yeah, they got them in stock. just go to the barrel that you want and hit send me reminder. and as soon as it comes in stock buy it because they go fast.

ar stone 1 in 7 5.56 is in stock

http://www.midwayusa.com/viewproduct/?productnumber=129589

the most common barrels i find they got in stock is there model1sales barrels. they got them in 3-4 styles/lengths but they seem to be getting shipments in about every 2 weeks of barrelss from model1sales

it seems model1sales is filling orders for bulk companys and thats why everyones order are on back order for 6-12 months lmao

Barney Gumble
07-31-2009, 8:18 PM
Nice necro-post from two months ago...

cackinthebox
07-31-2009, 11:04 PM
i think my armalite is fine, web says its .223/5.56

supersonic
08-01-2009, 9:42 AM
The whole "don't shoot 5.56 in a .223 gun" really only applies to bolt-action BR/Varmint rifles that have very tight tolerances (READ: TIGHT, MATCH CHAMBERS & ACTUAL .223 BORES INSTEAD OF THE .224/5.56 PIPE). I have seen many, many AR's that are marked ".223", but 99% of the time that means ".223/5.56" because the AR is a military design. Now, realize I said "99%." That leaves another 1% which may be a custom match/benchrest AR, although I've never seen one. I would just load up a mag and try it out. Pay attention to how the rounds chamber. Does the rifle have consistent difficulties extracting? If you experience any of these problems, or you are really concerned, slug the bore & chamber (or have a competent gunsmith do it). Hope that helps!
-Scott

bomb_on_bus
08-01-2009, 1:02 PM
LOL necropost

smle-man
08-01-2009, 2:52 PM
I've shot tons of 5.56mm ball through my Interarms Mini mkX mauser alledgedly chambered for .223 - no problems, no high pressure.