KWA M11 NS2 Short Magazine and Silencer

[TheOperator]

Hey people,
im new to the forum and just had a quick question,
Does anyone know where you can buy the short mag's for a M11?
Been lookin all over for one and cant seem to find one...
an also, when you attach a silencer to this gun, does it wobble?
i had a gun awhile back with a silencer of the same sorta size, and that had abit of wobble on it.

Cheers