Smith&Wesson M&P9 mag add-on
thingiverse
A +4 extension for the M&P 9mm 17-round mags is in the works. Some minor material removal may be necessary from the bottom of the follower to make it fit smoothly. The proof-of-concept model was printed using Hatchbox PLA at a 20% infill rate. To provide clearance for the back plate, I removed the plastic covering on the lanyard loop. This simple modification made all the difference. For optimal performance, extra power springs are highly recommended. Brownells' High Cap S&W M&P Extra Power Mag Spring (part number 078-000-168) is a top choice among enthusiasts.
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