Hi mate,

I've had both fsb and standard, both carbines. The standard 100 with moderator is quieter than the FSB. I currently have the FSB version with a moderator fitted and that is unbelievably quiet as you, in effect have 2 silencers - it's adds some length to the gun but not much, it looks fantastic aswell. No matter which 100 you go for you'll love it as it's a fantastic piece of kit.

Atb
John