MPX Extra Power Replacement Spring

(9 reviews)
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Silicon Carbide extra power spring for MPX with +10 basepad.

The extra power spring is designed to enhance feeding and to ensure the bolt locks back when empty.

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to



  • 5
    Gangbusters so far

    Posted by Matthew B Burch on Mar 12th 2021

    Initial impressions are prefaced by TT record of quality. That being said the quality difference in stock springs and TT springs is definitely noticeable especially during install. those tenderfoot fingers will feel it. Gauge of the spring feels denser than OEM, same dimensions but you can feel a difference. More compact coiling of the spring are obvious standouts. They line up easily in the magazine and merry up to the follower without issue. True to design they hold the claimed extended amount, essentially creating the capacity of four magazines in three. Additional weight is not a flaw because you know what you're getting into here. Practice reloading and shooting with these as they will change your timing, accuracy and efficiency until you are proficient. I found that the follower & spring had no issues bringing each round up and the heavier gauge allowed the action to cycle properly retaining the bolt to the rear once the mag was empty. My only gripe is the retention pin in the extender. I see this slowly working its way out over time and mostly likely during the worst possible time. Granted the extender slides along the magazine rail and offers a snug hold. Overall I found these to be a great addition to my loadout and look forward to updating this review as I push more rounds through them. Top quality!!

  • 4
    Very good

    Posted by Unknown on Oct 1st 2019

    Very good

  • 4
    Exicelant quality

    Posted by Bill on Aug 13th 2019

    The spring with the extension work great. The only problem is that the extension is very difficult to remove so the magazine can be cleaned. I had to drill a hole in the bottom of it so the spring could be pushed into the magazine allowing the extension to be removed without bending the spring. The only malfunction I have had with my MPX was due to dirty magazines. They need to be dissembled and cleaned.

  • 5
    Love Taran tactical products

    Posted by Nate H. on Feb 15th 2019

    The spring and the coyote Bass plate I bought work flawlessly for my Sig MPX 9 mm definitely buying more

  • 5
    been using these springs for about four years

    Posted by gene the old machinen on Apr 3rd 2018

    great mag springs , last for years undrer normal use

  • 5

    Posted by Anil "Isaiah" Lalani on Mar 23rd 2018

    Great product !!! im runing these on my TF mag EXT ... lock the bolt back every time

  • 5
    Just what I needed

    Posted by Chris on Sep 28th 2017

    I use these with Taylor Freelance +10 magazine extensions. I have them on two mags and both feed flawlessly. Both mags lock the bolt back when empty and after the last round. I have about 250 rounds and one range trip on them so far. I am very pleased with these springs as the factory springs are shorter and mine wouldn't hold the bolt open.

  • 5
    First match report

    Posted by Herb on Jun 12th 2017

    Springs approximately 1.5" longer than OEM. I guess this is because of the 10 round mag extensions shooters commonly add. Wire gage same diameter (.054") as OEM. Used in practice and PCC match this past weekend - about 200 rounds. Performed perfectly. Original OEM springs had failed to hold bolt open after a year.

  • 5
    You need this!!!

    Posted by on Jun 8th 2017

    I bought three basepads (TTI) and they didn't come with the Power Spring (I purchased thru another vendor). The bolt wouldn't lock back. So a buddy told me I needed these, man. I'm glad I got them. Bolt locks back, good pressure when you load the magazines, and also no feeding issues. Thanks.