i know it has the steel chassis like the other m&p pistols, but does it have that metal insert like the m&p 2.0 that's embedded into the frame itself?
the reason is we all know the shield is the least snappy gun of its class and that's partly due to the stronger construction and use of more metal parts, but i suspect it also has to do with the very strong recoil spring.
what if we can make it recoil even less? my adding a couple ounces to it via steel inserts directly into the frame?
my thinking is to cut shallow little alcoves length wise on the interior of the frame, add steel into those sections and epoxying them into place. it can perhaps even be done in the inside of the grip vertically so long as it is flush and doesn't interfere with the magazine itself
i feel thin long sheets of steel might work but at the same time perhaps a metal matrix using wires, like rebars, could work as well