BudsGunShop.com - Will this work with the six round magazine tube

James, yes sir it will. With the open front end design a longer barrel and mag tube can be used. Although it will not work with ATI and Wilson Combat extension with large attachment nut though. Hope this helps.

James, I can't see why not but, I would ask Bullpup Armory directly for accuracy at Phone: 704-488-7000 Mon-Sat 9am-7pm EST --------------- bullpuparmory.com/BPU500_Bullpup_Shotgun_Kit_p/bpu-500.htm