I always love Mossberg 590 as it designed and built tough. The 590M is even better with mag feed function, but they come as 18.5" barrel. We just have some factory 14" 590A1 conversion kit, so here we go, some experience we faced and learned, overall love this new looking!
The Factory 14" barrel conversion kit (92514)
Tube Nut 500A/835
M590/835 Mag Cap, Parkerized
Magtube M514, Parkerized
Magazine Spring Retainer 590/835, Parkerized
Spring, Magazine 835
Barrel Assembly 514 Bead Sights Heavy, Parkerized
Action Slide Assembly 500/514, Parkerized
We were thinking the change over would be easy as all we need to do that just remove the meg tube, put on the short one, put on new 14" barrel and pretty much job finished. But the first difficulty is that the mag tube has been red loctited onto receiver, we have to torch heat it to pretty high temp and then finally get it off.
Now we installed the short tube, loctited, put on new shorter front handle and barrel, but find that the bolt can not closed 100% because there's extra piece on 590M bolt compare to regular 590 which is for push the shell in mag into chamber. But the kit is for regular 590 so there is a cut we must do next.
Now we have the correct tools to make the cut.
Then Make it well cut.
The front handle also need to be polished to have smooth action.
Now the conversion is finished.
Hope you enjoy this conversion as we do, tks~!