Applies More Pressure To Follower For Smooth Feeding From Extended Magazines
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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Customer ratings for BROWNELLS S&W M&P EXTRA POWER MAG SPRING
Number of ratings: 3
From brownells.com: 3
Average rating: 4.7
Fits my M&P 9 10 round magazine(08/05/2011)
These are great springs. I could not find any springs specifically for the 10-round magazine for my M&P 9 so I bought these, hoping I could make them fit. They fit perfectly and they work even better then the stock springs. These springs do not hook into the hole on the magazine follower, but I do not see this as a problem.[...]
Thank goodness(14/09/2013)
Since S&W has, for whatever reason, chosen to leave us M&P users high and dry I had to find used mags that needed spring replacement. Thanks Brownells for this quality product. The used mags now function like the factory new mags.
better than the factory!(20/09/2014)
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)
Product no.: 078000168 BROWNELLS S&W M&P EXTRA POWER MAG SPRING050806003569 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.
9.9GBP18£9.90
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Delivery time approx. 7-14 days. More than 10 pieces in USA warehouse
Applies More Pressure To Follower For Smooth Feeding From Extended Magazines
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.
More...
Customer ratings for BROWNELLS S&W M&P EXTRA POWER MAG SPRING
Number of ratings: 3
From brownells.com: 3
Average rating: 4.7
Fits my M&P 9 10 round magazine(08/05/2011)
These are great springs. I could not find any springs specifically for the 10-round magazine for my M&P 9 so I bought these, hoping I could make them fit. They fit perfectly and they work even better then the stock springs. These springs do not hook into the hole on the magazine follower, but I do not see this as a problem.[...]
Thank goodness(14/09/2013)
Since S&W has, for whatever reason, chosen to leave us M&P users high and dry I had to find used mags that needed spring replacement. Thanks Brownells for this quality product. The used mags now function like the factory new mags.
better than the factory!(20/09/2014)
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)