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Gen 4 G21 reduced power loads vs. recoil spring

Discussion in 'Reloading' started by akroguy, Jan 1, 2012.

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  1. akroguy

    akroguy

    977
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    Dec 26, 2010
    I have a favorite load that is 5.6 gr of HP38 behind a 200 grn lead flat nose bullet from Missouri Bullet. My XD tactical loves it but it won't reliably cycle my Gen 4 21...just not enough oomph to cycle it with stock recoil spring. Does anyone have a spring setup for reduced power loads in the Gen 4 21? I can get a Gen 3 spring adapter ring for the gun, but then what pound spring to install? I'm using a Wolf barrel.

    The load is really nice and easy to shoot and I'd like to be able to feed it to both guns!

    Thanks.
     
  2. F106 Fan

    F106 Fan

    8,033
    268
    Oct 19, 2011
    Wolff makes 'calibration paks' that have various spring rates. You could start with the heaviest and work down.

    One problem: if the recoil spring gets too light, there is an interaction with the striker spring when you pull the trigger. The slide will come out of battery.

    Richard
     


  3. D. Manley

    D. Manley

    1,604
    0
    May 30, 2005
    Southern US
    Yes. You can get an adapter to run conventional Gen. 1, 2, or 3 recoil springs. As for spring weight, they are inexpensive enough to experiment a bit. You might want to start with the OEM 17 Lb spring weight but FWIW, I run 15 Lb springs in all my range Glocks including, 9MM, .40 and .45. The 15 Lb springs run anything from factory velocity to very soft loads reliably in my guns and I just like the feel of the gun better.
     
  4. akroguy

    akroguy

    977
    67
    Dec 26, 2010
    The loads are sooo close to working, and some do, so I think the next step down will work fine, and that would be a 15 pound spring? I have loads with the same powder charge, but behind a 230 gr lrn, so they generate enough chamber pressure to cycle the stock spring assembly just fine. It looks like the 15 pounder would optimize the gun for both loads nicely.
     
  5. D. Manley

    D. Manley

    1,604
    0
    May 30, 2005
    Southern US
    I have no experience with the G4 spring setup but from what I hear, they require a little more pressure than the G1, 2 or 3 OEM arrangements to run. You may well be able to run a 17 Lb spring (stock weight) if you wish but in my experience, there's no down side to a 15 Lb. I personally use the uncaptured rods so spring swaps are quick and easy but captured or uncaptured, it's no big deal. I do run stock spring weights in my defensive guns but there, I'm using pretty high pressure stuff.
     
  6. WiskyT

    WiskyT Malcontent

    11,682
    1
    Jun 12, 2002
    North Carolina
    I don't know what the Gen4 setup looks like, but with the old system, you can use IMSI springs on the factory platic rod.

    If you take a straight piece of wire coat hanger and run it up the rod from the rear through the hollow rod, you can push off the little platic cap that captures the factory spring. It snaps right back on. I've heard of people just leaving it off without problems. The IMSI springs are made of the same shape flat wire and fit the stock rod.

    The Wolff round wire springs might work on the stock rod, but they don't look right on there.
     
    Last edited: Jan 1, 2012
  7. shotgunred

    shotgunred local trouble maker

    8,781
    997
    Mar 1, 2008
    Washington (the state)
    On my Idpa gun (G35 gen 3) I run 15 pound springs. I have dropped as low as 13 but settled on 15 as the best for my gun.
     
  8. akroguy

    akroguy

    977
    67
    Dec 26, 2010
    Ok, got a 15 lb spring/stainless rod and spring adapter ordered. Thanks for the help, gentlemen!
     
  9. WiskyT

    WiskyT Malcontent

    11,682
    1
    Jun 12, 2002
    North Carolina
    That should do it.
     
  10. Messenger

    Messenger American Made

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    Mar 1, 2009
    Kernersville, NC
    I have been running a 13lb un-captured spring shooting target loads in 3rd gen 21sf. I can't remember ever having a malfunction.
     
  11. rebs

    rebs

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    Feb 23, 2012
    what is a captured and uncaptured spring in a G21 ?
     
  12. unclebob

    unclebob

    7,447
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    Oct 14, 2000
    Mary Esther FL
    Try leaving the slide locked back for two weeks. Also have at least 500 RDS. fired through the gun before I would start changing springs.
     
  13. rebs

    rebs

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    Feb 23, 2012
    What is a captured and uncaptured spring ?
     
  14. Lindenwood

    Lindenwood

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    Oct 27, 2011
    Captured means the spring itself is held on the guide rod so they come out together as a unit. Both Gen3 and Gen4 RSAs (Recoil Spring Assemblies) are "captured," in that the spring is held in place from both ends on the guide rod.

    Some aftermarket guide rods have a small allen screw that holds the spring on the end. You can leave this off, or use a rod without a screw at all, which leaves the spring "un"-captured. I.e., when you remove the guide rod, the spring can freely slide (or fly?) off the guide rod. Below is pictured an uncaptured guide rod, in that there is no cap on the front end of the rod to hold the spring on. I made this out of the unthreaded portion of a long 1/4" bolt, heh.

    [​IMG]