AR help please!!

BTW, if you upper is stamped .223 Rem, you cannot use 5.56 shells unless it has a Wylde chamber, i.e. .223 Wylde.
5.56 shoots .223 with no problems but the contrary is not true unless you have a .223 Wylde upper.
 
UR2X3M4ME said:
BTW, if you upper is stamped .223 Rem, you cannot use 5.56 shells unless it has a Wylde chamber, i.e. .223 Wylde.
5.56 shoots .223 with no problems but the contrary is not true unless you have a .223 Wylde upper.
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Well there is that point. In the end you should really only be shooting the round the barrel was designed for.
You might just be SOL for 5.56 in that barrel.
 
Ok so got some good help and so not so good help. Also co ya Ted DTI to see if they had any ideas. The barrel is stamped with 5.56. The rep at DTI as well as the guy go sold it to me has mentioned that maybe it might be a bit tight and need to break in the spring a bit more and or maybe just maybe a bad batch of ammo? Thoughts gents...?
 
Try the tape trick. If your ejector will close on 223, I don't see why it won't close on 5.56.

Got buddies with AR's ? Get them to bring a bolt to the range to try that they know works with 5.56.
 
Your BCG is used? Are the rings lined up properly at 120 degrees offset for the gaps? What kind of lower do you have? If used, how used? Whats the recoil spring like? Is the gun clean? What type of magazine are you using? If it is a "Canada Special" 10 round magazine good luck. Try a PMag 5/30. They are dog reliable. If the barrel said .223 I'ld only use .223 or else would trim my 556 back about 2mm.

There are a lot of things that can make an AR not function properly. If you are new to ARs it will seem daunting and that is why we are asking all these questions. It is very hard to troubleshoot something when you do not have it in front of you. Do not be discouraged but with all these great minds here we will figure it out and not break the bank
 
Are the rings lined up properly at 120 degrees offset for the gaps?
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This is a myth. They are like piston rings in an engine, once inserted in the carrier they close fully and there are no gaps.
 
The rep at DTI as well as the guy go sold it to me has mentioned that maybe it might be a bit tight and need to break in the spring a bit more and or maybe just maybe a bad batch of ammo? Thoughts gents...?
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I think they don't know what they are talking about? ;)
The spring isn't going to get more powerful after being worked in a for a while
And while it's not impossible for it to be out of spec 5.56, I doubt it.
 
Umm...piston rings don't close fully in an engine...
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Really? They don't? Well, you learn something new every day. Regardless, they do on an AR15 (or almost completely do) and even if they didn't and the gaps were all lined up, the gun will still run. :)

added - found this and while not 'completely' closed, it illustrates my point. the gap is bigger out of the carrier than it is when inserted

A ring gap may look significant when it's laying on the work bench, but compressed in the cylinder, it should be in the neighborhood of 0.018 inch.
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http://www.stockcarracing.com/techarticles/scrp_0409_piston_ring_gap/viewall.html
 
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