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firing pin spring


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Not sure but after a few light strikes in several M&Ps, they all get the extra power striker springs. Don't even notice them once you put the Apex sear in.

http://www.speedshooterspecialties.com/index.php?main_page=product_info&cPath=0&products_id=1022

Edited by High Lord Gomer
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The easiest way to test them out is to put them onto a shaft, like a small screw driver shaft and compress them to feel how much effort it takes to compress them. The stock spring still take more effort to compress. The stock springs are usually more Dull in color than the APEX as well. The APEX striker spring is pretty shiny. The correct answer is to count the coils and measure the diameter of the wire. I don't have the springs in front of me right now, but I would assume that the APEX spring would have smaller diameter wire than the stock spring because its lighter than the stock spring.

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