Is anyone rigging the gun for either freeshaft or line shafting underwater? I have a lineshaft 42" Biller that I want to be able to switch to free shaft underwater if need be. I have the tuna swivels but they will not clip through the gun or shaft slide. I think I remember that someone was using a stainless ring or wire that was swaged... Is that correct way to do it?

look up the spearfishing specialties quick release line rig....it's fantastic and build for your style gun

Is this kind of what you were thinking of?

If you put a screw on the bottom of your gun just in front of the handle you can wrap your line around the screw and the muzzle. After you've done the wraps, put another screw on the bottom of the gun to hook the tuna swivel to when freeshafting.

Thanks for the info