Best gun for 400 quid?

[Colonel Kurtz]

Tokyo Marui High-cycle series

[ImTriggerHappy]

Tokyo Marui High-cycle series

Awesome for Cqb not so good for outdoors.

Fps is low especially when you go for heavier bbs and I wouldnt feel comfortable trying to upgrade the fps.

[jcheeseright]

You can get a TM recoil shock SOCOM or CQBR from echigoya-guns.com for less than £400 all in, shipping on those models is (was? might still be) free so they work out considerably cheaper than they would in the UK even with VAT added on. My SOCOM came through after customs applied VAT at £330.

[dex]

Krytac CRB or SPR would be a good choice. No upgrading required.