What pus meant by "BB gun" for plinking is something like a Daisy BB gun that shoots .177 cal pellets NOT an airsoft.
As for you, if you're in Surrey you'll have to go to PoCo if you want a walk in store for airsoft.
If you want a "BB gun" or plinker then anywhere really, CT, Walmart, Hunting Stores, etc.
I really suggest something like an Anschutz if you want a solid ("competition grade") plinker. For recreation something like a Daisy will do well.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE