Glock 19 and 115 gr Rem UMC

Glock 19 and 115 gr Rem UMC

This is a discussion on Glock 19 and 115 gr Rem UMC within the Defensive Carry Guns forums, part of the Defensive Carry Discussions category; When I fire UMC through my G19 I often have the slide fail to lock back on the last shot. It only happens with this ...

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  1. #1
    Member Array WvHiker's Avatar
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    Glock 19 and 115 gr Rem UMC

    When I fire UMC through my G19 I often have the slide fail to lock back on the last shot. It only happens with this ammo (I keep oddly detailed records). Anyone else get this? Is it because these are short (OAL) rounds? Are they loaded "softer" or "weaker" than, say, American Eagle? I don't get this with American Eagle, Blazer or the Golden Sabres I use for carry, so I'm inclined to think that it isn't my gun or grip. Is this just an issue I'll have to deal with with UMC? I haven't shot a lot of the UMC hollowpoints (about 30, just to see how they fed-I still have about 70 of them I kept in case a racoon or whatnot needed dispatching), but is this likely to happen with them as it does with the FMJ?

    Anyone?


  2. #2
    Member Array mandalitten's Avatar
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    I doubt it has anything to do with the ammo, but it's strange that it appears to happen more frequently with this ammo. Look at the slide lock that is supposed to lock back when the magazine is empty. Does it happen on all mags, or just certain magazines? Is it a mag made for Gen4? Is it a 10 round mag? If you can narrow it down, maybe you can find out if someone else have the same problem.
    Have you made any modifications to the gun, such as the recoil spring? It's possible that the slide doesn't go far enough back to catch the slide lock, but this shouldn't happen with a factory gun and factory ammo.

  3. #3
    Member Array WvHiker's Avatar
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    The gun is absolutely stock; Generation 3. Happens with either of the two range mags, and only with that ammo. I know it shouldn't happen, but it does, and only under those specific circumstances. I know it sounds crazy, but it's true.

  4. #4
    Distinguished Member Array Fitch's Avatar
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    Quote Originally Posted by WvHiker View Post
    The gun is absolutely stock; Generation 3. Happens with either of the two range mags, and only with that ammo. I know it shouldn't happen, but it does, and only under those specific circumstances. I know it sounds crazy, but it's true.
    If you are registered on Glock Talk you might ask the question there on the experts forum.

    Fitch

  5. #5
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    This thread would go great in the "If you are allowed to own only one hand gun in your entire life what would it be?" thread!
    Ccccccc what? Ccccccccccc Hawks!

  6. #6
    Member Array WvHiker's Avatar
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    Thanks, I just went and posted it on GlockTalk. I hope this isn't an issue that will necessitate sending it anywhere. Though it would be a perfect reason (pronounced "excuse") to pick up a j frame.

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    Perhaps the UMC is low-powered enough to cycle the slide for reloading but not enough to catch the slide lock? I wouldn't get too concerned. Just don't use UMC for SD.
    Retired USAF E-8. Lighten up and enjoy life because:
    Paranoia strikes deep, into your heart it will creep. It starts when you're always afraid... "For What It's Worth" Buffalo Springfield

  8. #8
    VIP Member Array bsnow's Avatar
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    Sure sounds like an ammo issue to me. If your mag or mags perform fine with any other ammo and all else is the same, I say shoot up your UMC and move on to other choices. Nothing to worry about, that's why we practice different things at the range to find out what is and what isn't going to work. Good luck, let us know..
    Blessed be the LORD my strength which teacheth my hands to war, and my fingers to fight. PSALM 144:1

    I CLING to my guns and my Bible.

  9. #9
    VIP Member Array glockman10mm's Avatar
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    I had the same problem, but I tried different mags and found the follower of the newer mags had changed from some of the older ones I had. After using the new mags with the newer gun, I had no more problems. I discussed this with RamRod, here on the forum, as he is very knowledgeable of Glocks and he confirmed my suspicions. This could be the case for yours, but who knows, you may want to try it.

  10. #10
    dee
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    Here are some 9mm power factors a Long Time Glock Armorer gave me this info. He is a great person helps everyone. Is your 19 new? If yes then i would shoot some Nato spec rds like in 124 gr. to ease up the recoil spring and then you should shoot most anything.
    9mm FMJ Ballistics

    Brand Weight Velocity Power Factor
    Fiocchi 124 1180 146.32
    Fiocchi 147 1000 147.00
    Fiocchi 158 940 148.52
    Am Eagle 147 1000 147.00
    Win RA9124N NATO 124 1185 146.94
    RWS Sport FMJ 124 1181 146.44
    S&B 124 1181 146.44
    Rem. Express 147 990 145.53
    UMC 147 990 145.53
    Lawman 147 985 144.80
    Prvi Partizan 147 984 144.65
    S&B 115 1250 143.75
    Fiocchi 115 1250 143.75
    Am Eagle 124 1150 142.60
    Glock Minimum* 124 1148 142.35
    Win USA 124 1140 141.36
    Blazer 147 950 139.65
    Lawman 115 1200 138.00
    PMC Bronze 124 1110 137.64
    Win USA 115 1190 136.85
    Rem. Express 124 1100 136.40
    UMC 124 1100 136.40
    Am Eagle 115 1180 135.70
    Glock Minimum* 115 1180 135.70
    Blazer 124 1090 135.16
    Blazer Brass 124 1090 135.16
    Lawman 124 1090 135.16
    Cor-Bon match 147 900 132.30
    My Reloads 147 900 132.30
    PMC Bronze 115 1150 132.25
    Prvi Partizan 115 1148 132.02
    Blazer 115 1145 131.68
    Blazer Brass 115 1145 131.68
    Rem. Express 115 1135 130.53
    UMC 115 1135 130.53
    Federal Champ 115 1125 129.38

    *2000 Glock Armorer's manual
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  11. #11
    Member Array mandalitten's Avatar
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    You should contact Glock about it and let them know about the problem. That way you have started a record with them about the problem just in case you decide to send it to them in the future. The longer you wait and possibly start making changes to the gun or magazine, the less likely they are to want to do anything with it.

  12. #12
    Member Array JMB1911's Avatar
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    Response from the Glock Talk Expert Forum:

    "The current produced UMC 9mm 115 gr loads are proving to fail. This is they are under powered at best.
    The best fix:
    1 step up to 124 or 147 loads
    2 reduce your recoil spring weight to 11LBS "

    HTH, John

  13. #13
    jyo
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    UMC 9mm ammo seems somewhat under performing compared WWB or American Eagle practice ammo---works in my guns, but slide does seem to cycle slower. I would simply use other brands of ammo.

  14. #14
    RKM
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    This happened one time with my Hk using UMC. I never really worried about it. I shoot UMC alot. Never really had any issues other than one stove-pipe with my G30 and the slide not locking back on my Hk. Probably an ammo issue, maybe not. Just stop shooting UMC for awhile and make sure it stops. Then you'll have you answer :)

  15. #15
    Member Array WvHiker's Avatar
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    I only bought the UMC because it was cheaper than my usual range ammo, which is 124gr American Eagle. I'll just go back to American Eagle. I do notice that UMC seems a little "softer" in my gun than other ammo. And really it's not that big a deal; it doesn't always fail to lock open, just every now and again. I'll just shoot up what I have on hand and stop buying the cheapest ammo on the shelf. Blazer, Blazer Brass, WWB and Am. Eagle all work just fine, and none of them are exactly hard to get or pricey.

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