Quote Originally Posted by Trumpetier View Post
It's for a S510 Carbine, it has a shroud that offers little in the way of sound suppression, but works a bit. But the gun is pretty lengthy with a normal mod fitted, so it's a trade off between sound moderation and length.
Got a QTEC on my S510 Carbine. I have yet to find a better moderator anywhere. I also like the balance it gives the rifle.