Well g96 copy of Star/Ares aw338, help.

[chrisk545]

ve got a Well g96 which is a copy of the Star/Ares aw338 iam looking to upgrade it, trying to get more range out of it and make it quieter. Bought a silencer for it hasnt came in yet but just noticed that its a bigger thread on the gun. Also dont no what i have done but bb keeps rolling out the barrel it looks as if the cylinder head is pushing the bb past the hop up chamber is the hop up bucking isnt working as well.
Thanks for any advice.