If you get the delta strike its a wide bore so you lose a lot of fps and have to upgrade quite a bit to get it back. If you want to use a widebore try the orga barrels they are much better you can get them from Socom Tactical. Personally I would get a PDI 6.05 best barrel I have tried you can get them from a site called airlab. Airlab is a small seller but has some very good upgrade parts and is very helpful and trustworthy. Prommy barrels are a bit over rated in my opinion.