yes but op will come across less people they can legally sell to. I am a colonial Marine cosplayer a few of my group have signed pulse rifles (personally don't go in for it) to be morbid this would be worth money if it was Bill Paxton rather than Michael Biehn . He charges £30/40ish for a signature and gun fire has pulse rifles for £184.00 so maybe get £200 for it. you might have luck selling it internationally you have the replica prop forum, the Aliens legacy forum