M&P 45 Extended Mag Question

[BigT]

Does anyone know if the giant extension on the 14 round M&P 45 mags are necessary to stop over insertion, or if its just for "cosmetics"? I see the 10-8 floorplate for the 14 round mags has an extension that looks like its there to stop over insertion. Any issues running the full size mags in any of the compacts?

[MichaelD]

My only experience is with my M&P9c, but I use full-size M&P9 mags in it without any extensions and have no problems at all with overinsertion. I imagine the M&P45c wouldn't be any different.

[JMS]

If by "cosmetics," you mean "look as freakin' ridicuous as possible," I think you've got it. ;)

If the impetus of your question is whether or not you can use a 10-round standard M&P45 magazine in a M&P45c with confidence, you can. I encountered no more of an over-insertion problem with them than there is when using full-size Glock mags in a compact/subcompact. Same with the M&P 9mm variants, as MichaelD stated.

If the impetus of your question is whether or not you can reduce the oversized polymer abortion on the end of a 14-round M&P45 magazine and suffer no ill effects, you can. I never used the 10-8 baseplates, opting to grind the dog-snot out of the polymer to reduce girth and make them ACTUALLY managable during reloads.