See the small plunger head just above the mag catch button? That's the plunger that locks the mag catch button (which is a threaded nut) in place. The plunger head snaps up under the bottom of the button into one of 2 recessed spots located 180 degrees apart.
To adjust the mag catch button height
with the grips on the gun, place the EMPTY pistol on its right side on a flat surface. Place a nickel (right thickness) under the right side of the mag catch body (but just in front of the leading edge of the grip panel), so the nickel prevents the mag catch body from moving to the right (as you exert pressure on the button during adjustment).
Using a small (1/16") pin punch (or something suitably thin and controllable), depress the plunger and hold it down ...
Using your fingers (or a nifty spanner tool made by filing the middle of the end of a flat blade screwdriver), turn the mag button (nut) 1/2 turn. The goal is to end up so the plunger is either flush with the outside of the frame, or just slightly below the surface. You'll have to figure out which way you need to turn the button/nut to achieve this, and how many half-turns it requires.
As you raise the button/nut, the post (which is the threaded shaft of the mag catch body) will protrude less from the center of the button.
Now, the real goal here is make sure the mag catch will both hold the mag, as well as release it when desired. There is a range of tolerance when it comes to the consistency of size of "drop-in" parts like the mag catch, and armorers are told that if one such part (like a mag catch) won't adjust & work properly in one frame, to try another one (and the part that may not work in one particular gun may well work in some others
).
It's a "parts is parts" philosophy. Every once in a while you may get some combination where the allowable tolerances for each of the parts just falls together on the wrong end of things.
I agree that it's annoying to press on the button and have the post poke into your thumb. I've been able to adjust some buttons and make them work right in some guns, but every once in a while I've had to use a different mag catch in a particular gun (mostly because it wouldn't hold or release a mag as intended, but the "pokey" thing occurred now and again, too
).
Now, before you consider whether you feel this is something you may be capable to do this yourself, a word of warning ...
It's easy to unscrew the button/nut too far and have it come off unexpectedly. When that happens, it's REALLY easy to lose focus of controlling the plunger ... which is compressing a spring, remember ... and have the plunger sail off into parts unknown, sometimes never to be found again ... AFTER sometimes smartly bounce off your safety glasses (wear them), or into your eye.
), I'd not have written all that ...
