FN Tactical Police Shotgun - moddable?

[oicw]

Since the Benelli M4s90 is not in stock any where for a reasonable price I am considering a FN Tactical Police Shotgun. What's the recoil like?

Can the AR collapsable stock be replaced by an Ace skeleton stock ARFX?

http://www.gunsamerica.com/guns/976349172.htm


Can the grip be replaced by a Magpul Miad Grip?

http://www.impactguns.com/store/MP-MAG977-BLK.html

[oicw]

I found some pics at:

http://www.shotgunworld.com/bbs/viewtopic.php?t=40059&postdays=0&postorder=asc&start=180


http://www.shotgunworld.com/bbs/viewtopic.php?t=40059&postdays=0&postorder=asc&start=225

[oicw]

Can you buy TSP accessories and convert the FN Police pump to a TSP? Seems like the only differences are the sights, rail, pistol grip, stock and stock adapter. Does FN sell the separate parts?