Hi can anyone tell me how to change a mag nut on a 5906? I have one with an oversized black nut. I bought a factory stainless on but don't know how to remove the on on the gun.

There is a spring loaded lock plunger right beside the button. You need a small punch or paper clip to hold it down while you unthread the nut. You want something on the backside to hold the mag catch in while you do this.

There's a spring loaded detent that you should see at the bottom of the Magazine Catch Nut, some are to the side but the 5906 should be at the bottom IIRC? you will need to push it in with a dental pick or something similar & then thread the nut of counter clockwise..
Reinstall in reverse.. The detent has a spring beneath it, don't loose these two small parts..
I have a screw driver bit that the center is gone just for these if it's tight.. Try putting a drop of light oil on the center of the button beforehand such as Rem-Oil or WD-40..
You can probobly turn it with your thumb by applying preasure & supporting the other side while depressing the detent..
Good Luck!!
Gary/Hk

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MightShowYouHisSmith&Wesson

Thanks for all the info. It worked great

If it hasn't been mentioned, when the mag catch nut is reinstalled, it should be adjusted so that the plunger is flush with the frame or slightly below the level of the frame.

Naturally, the mag catch must function normally in securing and releasing the magazines when installed.

Occasionally a magazine nut may feel rough in operation. If it's an older combination of parts it may be due to oxidation and corrosion on the spring and inside the spring hole. (When someone allows a gun to be submerged, and doesn't tell anyone about it for a year ... it can be annoying.) If it's roughness occurring with new parts, armorers are taught to deliver an impact to the catch nut with a plastic mallet to see if that 'frees up' movement and removes the roughness. I can only remember having to do that a handful of times over the years in older 3rd gen guns. (Newer guns and parts have some much better tolerances. )

Every once in a great while I've come across a combination of new mag catch parts (mostly a mag catch body or nut) that just didn't work right in a particular frame, or wouldn't hold a mag securely. The last one was in a recent; production 4513TSW. The easiest solution (which worked) was to try a different set of mag catch parts in that particular gun.

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Ret LE Firearms inst & armorer