Trigger switch assemblies are usually about 10 to 20 pound, not sure exact cost or best place to get G&G spares from as I dont like G&G so never look.
Google it should be easy enough to find.
You can import from the US but its not worth the hassle. A lot of US shops stopped importing because guns kept getting destroyed by customs. Also it will come with an orange flash hider and will probably be firing hot. So by the time you have paid shipping,import tax, replaced the flash hider and had it down graded you will probably have saved nothing.
If you get the gbb down grading is not a big issue but everything else is.
You have no defence so it will need to be two toned. Just a word of warning customs have been known to destroy mags because they can be classed as a pressurised container. Also are you over 18 because if not then its illegal for you to buy an airsoft gun.
Seriously listen to the good advice you have been given and rent first.
You might hate it and just waste your money a lot of people find this out. Researching it on the internet is not the same as playing.
Cant believe this is really a question.
I have given bbs, tracer bbs, various batteries, pyro and I even gave a kid my back up aeg because I felt sorry for him even chucked in two batteries and charger.
Maybe I am too generous but one day it might come back around.
How can you be selling bb guns when you dont know the laws.
There is no licence only a defence. The main one is UKARA which as a retailer you should be a member of.
Obviously you know nothing about Airsoft or airsoft guns so please find out what your talking about before posting.
By the way heres a saying for you;
All airsoft guns are bb guns
But
Not all bb guns are airsoft guns.
What your trying to sell are not suitable bb guns for airsoft.
Can vouch for that I had a CRB and SDP delivered the other week and they hadn't been opened or tampered with. Also had no problems taking a CRB to bits so not sure whats gone wrong with yours.
Probably will be around that. A springs rating number is meters per second, 110 mps is 360 fps. Thats only a rough guide though as lots of factors play into it. Fps will be affected by your compression as much as spring which is why most of us spend so much time making sure all the seals are perfect. It varies from gun to gun even when made by the same manufacturer.