GHK Knights Armament Company PDW Gas Blow Back. They don’t make these anymore and I’m not sure why, but it was the closest to the real deal. Comes with one GHK GBB mags, 2 G&P GBB mags, and 2 King Arms GBB mags. The King mags are finicky, but I’ll include them anyway should you be smarter than me and get them to function properly. The other 3 work flawlessly. Solid, full metal construction and monolithic. Stock folds and locks. Repro SRS, irons and KAC Vert grip included...tracer and weaponlight are not. More pics available upon request. Buyer pays shipping. Thanks.