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Thread: My middy is shortstroking!!!

  1. #11
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    Wolf is notoriously weak ammo.

    The first thing I would try would be some good commercial grade .223 Rem ammo like American Eagle, Federal XM193 or some NATO spec 5.56mm ammo and see what happens.

    The only way to over lube an AR15 with oil would be to submerge it in oil.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  2. #12
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    Oh I thought I explained that. I have tried it with single shells and it won't lock open, or when the mag is full it won't pick up a shell. Sometimes it does work fine and sometimes it doesn't. Is this short stroking?

    I'll go grab some better ammo today and test it out...

    Do you all think it would be worth trying a lighter carrier out of a buddies gun? I've got about 1500 rounds of this ammo, lol.

  3. #13
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    Quote Originally Posted by kpk View Post
    Oh I thought I explained that. I have tried it with single shells and it won't lock open, or when the mag is full it won't pick up a shell. Sometimes it does work fine and sometimes it doesn't. Is this short stroking?

    I'll go grab some better ammo today and test it out...

    Do you all think it would be worth trying a lighter carrier out of a buddies gun? I've got about 1500 rounds of this ammo, lol.
    Try some known good mags. Known good meaning that they can lock the bolt back when empty on all other ARs.

    Use the more powerful quality ammo.

    Load several mags with 1 round each and fire the one round. Did it lock back?

    If it did then load 2 rounds per mag, attempt to fire both rounds, did the second round feed and fire?

    If it doesn't work with this try a known good bolt carrier (one that works well in another rifle). Use your own bolt, cam pin, firing pin and firing pin retaining pin. Then try the 1 round per mag test again. If this other carrier makes the gun work then it's leaking at the carrier key.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  4. #14
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    Well I think you all called my BS...and I think my gun is just being a picky bitch!

    Went to Wal-Mart and picked up a couple boxes of Remington UMC (I know not the best). Brought them home took out 3 pmags and the cmmg mag. (day before yesterday I was using only one pmag). The pmag I used the other nice worked the first couple of rounds, but wouldn't lock the bolt (with wolf). So I grabbed the cmmg and fired 30 flawless rounds with Wolf ammo and locked the bolt. I shot a whole box of Wolf through the other two pmags w/o a problem and would lock back fine. Then I tried the umc with the "bad" pmag and it worked fine, and btw you can tell 50% difference in power between the ammo.

    So I think I have come to the conclusion that the Wold is to weak for that one pmag (???is that weird?), but works fine with the umc. Now the others run fine with both ammos.

    Come to think of it the "bad" pmag is the one I keep loaded for home defense. Could the spring be the problem?

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