To clarify Rommen's comment - Most barrel threads are 14 mm CCW. There are a few manufacturer exceptions that I've read of (don't recall which ones), but the majority are 14mm CCW. Hence, most airsoft silencers are threaded 14mm CCW.
For those few airsoft gun manufacturers that use a CW thread, there are barrel adapters available.
VFC SCAR-L - VFC SCAR SSR - KJW Hi-Capa 5.1 - CAW M79
The Three Sisters - WE G39 E/K/C
Originally Posted by kalnaren
Stalker stays where he is.
His BB's fly across the country to hit their target.