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Thread: Help with 1911 Magazine Reliability

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  1. #1
    Join Date
    4th June 2016
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    Southwest Missouri
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    Help with 1911 Magazine Reliability

    Hello all


    I have a STI 9mm Escort which I love, but need some guidance on tuning/improving magazine reliability. Here are the magazines I have and their performance with the STI (all magazines are new). Ammo used was Federal 124gr HST, Federal 147gr HST, Remington HTP 147gr, PPU 115gr JHP, Starfire 124gr JHP, Fiocchi XTP 147gr, Fiocchi 147gr JHP, Fiocchi EMB 92gr, and ARX Polycase 56gr. Tested both with full mag alone, and full mag with round in chamber:


    * STI stock 8rd magazine - works fine with all ammo tried except Fiocchi XTP 147gr & Fiocchi EMB (one jam only each).


    * Mec-Gar 9rd stainless - worked OK, but commonly did not lock slide back when empty


    * Metalform 10rd stainless - worked OK, no jams


    * Wilson 8rd stainless - common fail to feed jams with most ammo tried


    * Metalform 9rd black - common fail to feed (nose dive)for 2nd round (1st out of mag)


    I have reviewed the posts on mag tuning, and recommendations include combinations of Wolff Springs, Grams Engineering Followers, Dawson Tuning kits, etc. But most posts appear to be for 2011 pistols. So, I need some suggestions on what specifically to try for a single stack, 1911 magazines for the STI.


    Thanks in advance for suggestions!
    Geologist Bob
    US Navy P-3 Pilot, Army Guard Huey & Blackhawk Pilot (ret.)
    XDS-3.3 bitone, CZ RAMI-D, 709 Slim, CharterArms PitBull - all 9mm, & Sig P238
    Citori Crossover Target O/U, Mossberg 91, Hawk 982 - all 12G
    NRA Life Member, Scottish American Military Society Life Member, Oath Keeper

  2. #2
    Join Date
    9th June 2004
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    Are your Metalform magazines rear spacer or "front ramp"?

  3. #3
    Join Date
    26th December 2015
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    I would recommend trying Tripp Cobras for 9mm 1911. Based on the outstanding reputation of Mec-Gars for Browning HiPowers I bought Mec-Gars for my 9mm build and was very disappointed. Multiple recommendations from others here lead me to the Tripps for 9mm 1911 and all my mag problems are resolved.
    Last edited by Mark75H; 26th April 2017 at 14:37.


  4. #4
    Join Date
    4th June 2016
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    Hi Jim - My Metalforms are both rear spacers. Unusual that the 10-rd stainless one works fine, but the 9-rd black one has multiple fail-to-feed jams. Someone suggested loading the mags and letting them sit for a week to "tune" the spring.

    Hi Mark - I will look into the Tripp cobras. Of note, the single Meg-gar 9rd mag that I have feeds just fine, but rarely locks the slide back when empty. The real disappointment was the Wilson 8-rd mag, given the reputation that Wilson has.

    Thanks for your inputs, gentlemen!
    Geologist Bob
    US Navy P-3 Pilot, Army Guard Huey & Blackhawk Pilot (ret.)
    XDS-3.3 bitone, CZ RAMI-D, 709 Slim, CharterArms PitBull - all 9mm, & Sig P238
    Citori Crossover Target O/U, Mossberg 91, Hawk 982 - all 12G
    NRA Life Member, Scottish American Military Society Life Member, Oath Keeper

  5. #5
    Join Date
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    Time to talk to STI or maybe Brazos or Dawson.

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