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-   -   5.56 or .223 does it matter? (http://www.firearmstalk.com/forums/f20/5-56-223-does-matter-87851/)

srohda 03-30-2013 11:01 PM

5.56 or .223 does it matter?
 
2 Attachment(s)
I finally got my hands on a lower after months of searching, $140 not bad. It is labeled cal. .223-5.56. Is there a difference in parts kits and what I mean is do certain lpk's only work with .223 and others with 5.56? I thought both rounds were the same. Also same question for uppers. Just trying to figure out what to buy. Thanks!

Attachment 93755



Attachment 93756

Gatoragn 03-30-2013 11:13 PM

There is a difference, not huge, but a difference. Just be sure to use an upper chambered for 5.56 and you can shoot either one.

You can use the lower for any AR15 caliber you want, 6.8 spc, 458 Socom, etc.

bluez 03-30-2013 11:25 PM

A firearm that marked 5.56mm can shoot both 5.56mm and .223.
they are slightly different w/ 223 being the softer round.

For this reason its ok to shoot 223 in a 5.56 gun but not the other way around.

srohda 03-30-2013 11:30 PM

Alright thanks for the info

lbwar15 03-31-2013 12:43 AM

Just get a barrel for 5.56 so you can shoot both. Everything elts is the same.

c3shooter 03-31-2013 01:47 AM

HELLO! pay attention, now! He has a LOWER with that marking!

The critical bit is the UPPER! As said, get a 5.56 upper (or .223 Wylde) and you can shoot either. Marks on the lower do not matter in this case.

fsted2a 04-08-2013 09:20 PM

Quote:

Originally Posted by c3shooter (Post 1197386)
HELLO! pay attention, now! He has a LOWER with that marking!

The critical bit is the UPPER! As said, get a 5.56 upper (or .223 Wylde) and you can shoot either. Marks on the lower do not matter in this case.

Legal wise, the 5.56 and .223 are identical. Like everyone says, going with the upper, you should get the 5.56 so you won't have any mechanical issues. A .223 chambered upper might have some feeding problems with the 5.56 ammo. That said, depending on which state you live in, if you swap with a , say, 7.62x39 upper, you may have some legal challenges.

Quentin 04-09-2013 06:55 AM

Most rifle kits have a 5.56 upper but otherwise most kits are crap, though PSA's is good. I'd look for quality parts not the cheapest kit with ugly parts.

nosaj 04-09-2013 07:32 AM

Quote:

Originally Posted by fsted2a (Post 1207492)

Legal wise, the 5.56 and .223 are identical. Like everyone says, going with the upper, you should get the 5.56 so you won't have any mechanical issues. A .223 chambered upper might have some feeding problems with the 5.56 ammo. That said, depending on which state you live in, if you swap with a , say, 7.62x39 upper, you may have some legal challenges.

Why would 7.62x39 present legal challenges?

EW1066 04-09-2013 04:07 PM

Quote:

Originally Posted by nosaj (Post 1208140)
Why would 7.62x39 present legal challenges?

In a sane world it won't. BUT, an ar that is registered as a specific caliber is "TECHNICALLY" restricted to shooting those calibers. Should a person find themselves in a twist with the BATFE, shooting a 6.8 upper on a lower marked 223/5.56 could be grounds for probable cause for an aggressive investigator or just another charge to pile on. Having a lower marked "MULTI" is far more desirable for avoiding such technicalities.

That being said, The probability is very very slim that the average person will find themselves in such a situation.

If you live in a state that is less than friendly towards guns. If you are shooting at a public range where LEOs also shoot. If they think your rifle does not "sound" correctly, they could come over and do a visual inspection of your weapon and life gets difficult from there. This applies to shooting a .22 cal conversion kit as well.


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