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Thread: Failure to Return to Battery and How Dirty is Too Dirty!

  1. #21
    Join Date
    2nd June 2004
    Location
    Terra
    Posts
    20,321
    Posts liked by others
    87
    To eliminate the slide stop as the cause, remove the slide from the receiver and reinstall just the slide stop. Load a magazine and tap it on something to be certain that all rounds are fully toward the rear.

    Now insert the magazine into the receiver while watching the slide stop. See if the bullet of the top round clears the slide stop lug, or scrapes against it. If it clears, nudge the top round forward just a tiny bit and try again. What you want to do is find out how far a round would have to move forward under recoil to cause a problem. If your magazine followers have the dimple, load just one round and then push that round forward to where the case mouth is stopped by the dimple (which is why it's there). Then try the test again. If a round that's properly located at the dimple (not forward of it) makes contact with the slide stop, then it's time to break out the file.

    The reason I specified a half-round file is that you want to remove as little material as possible. Using a half-round file (preferably a fairly small one) allows you to contour the lug around the shape of the bullet.

    You can also alter the outer portion of the slide stop to increase resistance to being pushed up. I think Brownells sells a spotting drill that's sized to go in through the plunger tube and drill a small detent for the tip of the plunger to engage. You can control the amount of resistance by how deep you drill the depression.
    Hawkmoon
    On a good day, can hit the broad side of a barn ... from the inside

  2. #22
    Join Date
    23rd September 2011
    Location
    Colorado
    Posts
    87
    Posts liked by others
    0
    I thought I'd post an update. I've continued shooting the pistol and eliminating magazines involved with malfunctions as I go. I've also been carefully and gradually filing the slide stop where the copper marks show up, being mindful to leave the front of the lobe alone.

    So far, the new Wilson Combat ETM mag has yet to cause any issues. I've eliminated four of my eight Checkmate Mags. I am starting to wonder if this was all just related to magazines after all. It's just surprising that half or even the majority of my Checkmates would be bad. I'd also assumed a GI-style mag with the dimpled follower would be more reliable than something like the ETM, which lacks a dimple. Regardless, if switching mags causes all issues to dry up, it'll be a good sign. If not, the gun's going to Wilson for custom work.

  3. #23
    Join Date
    2nd March 2005
    Location
    North Texas
    Posts
    806
    Posts liked by others
    15
    Are you shooting factory ammo or reloads or re-manufactured ammo? Out of spec ammo can cause the problem you are describing

  4. #24
    Join Date
    23rd September 2011
    Location
    Colorado
    Posts
    87
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    0
    Only factory ammo, and only 230gr FMJs. I wish I could reload so I could feed my M1 Garand for cheaper, but I don't have the time or space for it at the moment.

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