Is the airsoft p90 box magazine/m4 mag adapter worth the buy?? - YouTube
M4/M16 Magazine Adapter for P90 Replicas - shop Gunfire
Precision Combat Arms - This shows some of the things that you can do with your King Arms P90; Echo 1 M4 magazine adapter with H&K style suppressor covering a 420mm 6.01mm
SCG P90 to M4 magazine adapter
Evike.com Custom P90 Terminator Airsoft AEG w/ Box Mag (Color: Black), Airsoft Guns, Evike Custom Guns, P90 / E90 series