This is a PRE-BAN EGW compensator. (Meaning 22mm O.D) I have heard these called "SOF comps," "Cheat comps" etc. It is essentially an A2 flash hider that has a stainless washer silver soldered at the end.
This one is lightly used and still very serviceable. Just the ticket for an extra edge in 3 gun or modify the O.D. over or under for a post-ban legal "A2 look" compensator.
$25 postage and insurance paid to the continental US (AK and HI $2 more)
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