re: M&P Shield break in

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It is not a slide release, only a slide lock back. Pull back slightly on the slide and release it. I have seen on other blogs that forcing the slide lock down to release the slide will wear the metal to a point where it won't hold the slide back at all.

With an empty magazine, the slide release will not work with one thumb unless you pull back on the slide. In fact, it's nearly impossible to drop the slide unless you pull back on it first. With a loaded magazine, the slide release works easily with just one thumb. The slide lock lever sticks into the magazine well. When the magazine is empty the corner of the follower pushes up on the lever. That is how the last round hold open works. When you try to push the lever while there is an empty magazine in the gun you are fighting both the magazine spring and the friction between the lever and slide.

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