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AR Question ??? - Update :

abcguns2
Standard ar-15 , apx. 500 rounds fired , Now , most of the brass is showing a faint crack(?) apx. half way up the brass ???
Any ideas ?
Thanks !!!
d.a.stearns ............ a.k.a. ............... SKEEZIX ............
Gunsmith / LEO
Athens , Tn

OK, after some checking , the Chamber had a 'offset' in it that was visable in sun lite ? talked to Delton (DTI) , they said it was defective and are replacing it !!!












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Comments

5 comments

Date Votes
  • tsr1965
    Hard telling, from the vague description, of "standard AR-15". Was it all factory built, or put together by someone with lesser skills and tooling? If it was factory built, by who? What type of ammo are you shooting in it?

    Let us know some of the particulars.

    Best

    EDIT 1

    quote:Most AR chambers are cut by "someone with skills and tooling" whether the rest of the rifle is assembled by others should not have any bearing on the chamber issue.


    Mobuck,

    You are very incorrect in that statement, as a whole. When assembling the barrel to the upper reciever, and headspacing, the person doing the work, should know what they are doing. Excessive head space, will lead to a ruptured case. So will a loose barrel, as I have seen in an AR-10 that was assembled by a wannabe.

    Also, keep in mind, that just because someone knows how to turn on a lathe, does not mean they are skilled.

    The very fact, that I asked if factory made, by who, is valid representation of the above. If it was made by Hesse, Blackthorne, or Vulcan, all bets are off.

    Best

    EDIT 2

    givette,

    quote:Let's face it: If you have a barrel (with the extension installed) in one hand, and a complete bolt assembly in the other, and slide the bolt assembly into the barrel until it bottoms out against the extension, voila! You will get the correct headspace!


    This does not always hold true, and once again, depends on who installed the barrel, extension, and the bolt. Yes, a lot of times, they work interchangably, but they are not always plug and play. There is a recent thread on AR headspacing.

    http://forums.gunbroker.com/topic.asp?TOPIC_ID=550947

    I'm pretty sure, that the gentleman giving the advice to leave it to those who know how, has built more AR-15's than most have looked at.

    Best
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  • Mobuck
    Most AR chambers are cut by "someone with skills and tooling" whether the rest of the rifle is assembled by others should not have any bearing on the chamber issue.
    The problem could be brass related as in reloaded too many times, just plain brittle, or otherwise unsuitable or it could be getting gouged during chambering.
    I would suggest using some fresh factory ammo, loading the rounds by hand in a way as to determine where the "crack" may be occurring within the chamber, and firing single shots to get some basic results.
    Any other visible oddities on the brass like bulging?
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  • abcguns2
    OK ,
    Thanks !
    Its a DPMS factory upper on a ??? lower , looks as if its trying a 'case seperation' in the middle of the cases (w-factory ammo) ?
    Thanks !
    d.a.
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  • givette
    Let's face it: If you have a barrel (with the extension installed) in one hand, and a complete bolt assembly in the other, and slide the bolt assembly into the barrel until it bottoms out against the extension, voila! You will get the correct headspace!

    The bolt head's relationship with the barrel is what matters!

    If other influences prevent proper headspacing, such as an improperly installed barrel into the upper receiver, you will not get complete barrel-to-bolt lockup! That, in and of itself, is not a headspace problem...it's an 'out of battery' problem! Joe

    Joe

    EDIT
    Here's an example: The .50 Browning M2, or the M1919 .30 cal needs the receiver to accomplish final headspace fit..as the bolt does not lock directly into the barrel prior to ignition.

    Now, you take an MG42, or a M-60 machinegun..all you really need is the bolt and the barrel to accomplish a headspace check, as the receiver is not part of the equation..the bolt locks directly into the rear of the barrel!

    Best again, Joe
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  • nononsense
    abcguns2,

    quote:OK, after some checking , the Chamber had a 'offset' in it that was visable in sun lite ? talked to Delton (DTI) , they said it was defective and are replacing it !!!

    Thank you for following up with the solution to your question. It's always nice to read about the resolution of problems AND to see a manufacturer step up with great customer service.

    Best.
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