S&W M&P EXTRA-POWER MAGAZINE SPRING
Description
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 followers 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.