SureFire "Classic" Universal weaponlight. Looks like a 6P but is about 10% larger/longer and includes all the shock-isolated parts needed for life on a long gun.
Includes both tape-switch and pushbutton endcaps, battery pack, velcro fasteners for mounting tape-switch to handguards, polymer belt holster and instructions. Used but in excellent condition, batteries are fresh. Does not include mount, but there are plenty of aftermarket options available.
Asking $150 shipped.