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MPX Extra Power Replacement Spring

10 reviews Write a Review

MPX Extra Power Replacement Spring


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

  • i let sit loaded for and hour or 2 and ready to go

    Posted by good springs there a little stiff a first on Jul 18th 2022

    my ejector got rounded double feeds stove pipes i thought mabe springs until i saw how beat up it was springs last and last

  • 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!!

  • Very good

    Posted by Unknown on Oct 1st 2019

    Very good