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Brian Enos's Forums... Maku mozo!

Grods

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Posts posted by Grods

  1. 55 minutes ago, gerritm said:

    I have shot an MKA 1919 for many years. Not knowing what parts are in that or how it is set up, hard to tell. Does it happen with all ammo? Depending on what recoil spring is in it it can be that with hotter/lighter FPS ammo the bolt is cycling too fast/slow and not having time to go far enough back to strip the next round off correctly. Mine will do this with hotter ammo 1300 FPS and up. Over runs the bolt. Or you are not running hot enough ammo and again it is not cycling completely. Try different FPS ammo to see what it likes. Key is it happens with all mags. 

     

    I run Win AA 1145 fps to 1250 fps only in competition because the shell case is smooth, feeds well,  and is hard and are way more reliable than other brands. Yours may need hotter FPS to cycle properly. Not sure where you live, but here in Texas on a hot summer day the cheap brands will actually deform from the heat.

     

    gerritm

     

    Usually it happens with hotter ammunition like slugs. I seem to have less (but still happens from time to time) trouble running skeet/trap birdshots. More frequent when using slugs like some competitions here require. To my eye it looks like on the video that the bolt has quite a bit of excess velocity when it cycles, but that next round pops out from the magazine before bolt even starts to close.  12/70 rounds actually have enough room to pop out from the magazine even when the bolt is closed if they are bumped forward enough so that could be another reason.

  2. Noticed many people here have experience with MKA 1919 type semiauto shotguns. Mine is Axor MF3, as far as i can tell it uses same mags and is pretty much a cheap turkish clone of the 1919.

     

    Most of the time it works fine, but this one type of jam has plagued the gun since new and it happens with all magazines, i usually get something between 50 to 200 rounds between jams and thats kind of bad for competition. Heres the slowmo of my friend shooting the gun before i got it showing whats happening:

    https://drive.google.com/file/d/1uKmD7n8aK8UT4YTfMMWNBvUr7_GkDNUE/view?usp=sharing

     

    As far as i can tell its recoil of the gun stripping the next round from magazine too early causing it to fly around the upper receiver slightly before the bolt would strip it. I tried bending the mag lips inwards to make it less likely for a round to strip by itself due to recoil, it reduced this jam (earlier it did this almost every 10 rounds) but didnt completely fix it.

     

    Any ideas? Its not only costing time in competition, but im worried about that ejector hitting a primer on that jammed shell with bad luck.

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