What the heck did I buy? AR-15

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floorit76

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Bought an AR off Gunbroker earlier this week. Lower is marked Rock River, but I can find no marks at all on the upper. It was sold from a pawn shop, as a 5.56mm. Tonight I decided to try it out. Steel case wouldn't go into battery, so I tried a brass case and it did. I ejected the round and found that it had developed an extra shoulder. (Shown in pic, beside normal round) Upon inspection, the bore looks slightly larger than a 5.56, and 223 ammo fits high and loose in the chamber? 6.5? 7.62? Where would I find a mark? I haven't removed the quad rail, but I did look in the slots with a light and saw no markings anywhere on the barrel. ????????????????? :what:

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Look on the bottom of the barrel. You may need to remove the hand guard.

Also, check the magazine. It might tell you.

Failing that it might be time for a trip to the gunsmith for him to cast the chamber.
 
It should be under the quad rail just in front of the barrel extension, left side.

URL to the auction it mat have a clue
 
Very interested in the results of this one. Gunsmith would probably be your best bet.
 
Mag only reads C products LLC Newington Ct. Removing handguard will have to wait till I get home later.
 
If it was a 5.45mm Russian, the bore would be smaller, not larger then a .223 and you would have rifling marks on the bullet.

attachment.jpg

Plus, the case on a 5.45mm is shorter to the shoulder then a .223.
If the bore is smaller then a .223, then it probably is a 5.45x39.

Good luck with that.

rc
 
But isn't the case on the .223 longer than the 5.45? That's what that bulge looks like, like it was pushed in and squished, and like the ogive was too big, and pushed in from there.
Click to expand...

It is longer, but close to the same width. I'll post a pic of the cases next to each other in a minute.

Edit:
90684a3e.jpg
 
Measuring with the calibrated eyeball, the bore looks slightly larger than my 223, but smaller than my 7.62.
 
k im dying to know this one! any word in the short time elapsed? but wouldnt the smaller shoulder mean it should be smaller than a .223?
 
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