The reliable Russian Makarov 9x18 single stack 9x18 pistol has an interesting grip.
It is relatively thin compared to its front to back dimension.
It fits the hands of some, but to me it feels like gripping a 1" by 2" piece of lumber.
The good news is that the Makarov internal magazine structure is quite narrow,
and the grip seems to be made out of sandable Bakelite, which is an early plastic.
As an experiment, an inexpensive replacement grip was sanded down
to provide contours on the rear using the rounded end of a belt sander.
The front to back dimensions were also reduced by sanding the rear only.
No changes were made to the grip's front, top, or bottom.
The modified contoured grip made it easier to manage recoil and
made the Makarov much more pleasant to shoot.
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