Since it so easy to remove a semi auto barrel for cleaning, I use the convention brass brush and JAG patch. A bore snake does a rather superficial cleaning job, which often is all that is needed. However, sometimes you really need to clean out copper or lead (or both) residue, and a bore snake won't get it.

I use Brownells action lube on the rails of my M&Ps. Most anything works; don't overlube it.

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Science plus Art