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S&W M&P EXTRA-POWER MAGAZINE SPRING Reviews & Ratings

Extra-length magazine spring replaces factory-supplied spring for use with aftermarket magazine extenders and extended base pads that increase round capacity. Gives follower up to 10% more power for smooth, reliable feeding of rounds. Made of certified aerospace-spec chrome silicon wire, then heat-treated and stress-relieved to ISO 9000 standards.

SPECS: Chrome silicon steel wire. Fits S&W M&P pistols chambered in 9mm, .40 S&W, and .357 SIG.

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3 Stars

2 Stars

1 Stars

10%

Reviews Summary

Reviews for the S&W M&P Extra-Power Magazine Springs reflect a mix of satisfaction and some confusion with sizing and shipping costs. Users found the springs notably improved the performance of their magazines, allowing for better feeding and capacity. However, some encountered issues determining the right fit and felt shipping costs were high.

What Reviewers Are Saying

Product Effectiveness

60%

Many users report that these springs significantly enhanced the performance of their magazines, allowing for better feeding and increased capacity. Reviewers noted improvements in functionality, especially when replacing weaker stock springs, making them a popular choice among M&P users.

Shipping Costs

40%

A recurrent theme among the reviews is the perceived high shipping costs associated with purchasing these springs, which some customers found to be discouraging. This has contributed to an overall sense of dissatisfaction regarding the affordability of the product.

Sizing Confusion

30%

There is some confusion about the sizing and compatibility of the springs, with several customers noting that they ordered the wrong type based on the descriptions provided. Clarifications regarding compatibility with specific magazine types could enhance the shopping experience.

Quality and Durability

50%

Customers consistently highlight the quality and durability of the extra-power spring, indicating that they are a reliable upgrade over factory springs. The solid design reduces issues like binding, which enhances user satisfaction.

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S&W factory carbine mags

FYI, these springs are shorter than the factory spring for 23 rd FPC and Response, just to clarify.

Would you recommend this? Yes, I would recommend to a friend

by JIM B. on November 04, 2025

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Was this review helpful? 1

better than the factory!

I have been using these for the extended 45mags for a few months now and have had good results. The factory springs were designed poorly and with the taper would it would impinge on itself then bind up and become useless and it was almost impossible to get the 14th rnd in. These are more of a solid design and won't bind on themselves. I have had issue with the mags not actuating the slide catch on the last round and failing to lock back but it is still better than the factory ones binding half way through a mag. (Note: The description can be deceiving when it says high capacity. I don't think they were intended for the 14rnd 45 mags but they do work better than the factory)