Another option is to get a 2" barrel extension. They exist but I don't know who makes them. IIRC VFC has one and Madbull may have one (and I assume there are ACM and Element versions out there) but look around at other companies if you want.
ie. looks like this - CCW to CCW threading:
http://shop.ehobbyasia.com/accessori...n-ccw-ccw.html
NB: G&P barrels are CW threading so if you get a barrel extension you must get a CW to CW extension if you want to keep the original flash hider (or CW to CCW if you want to change your flash hider appropriately).