Absolutely stunning Heckler & Koch Model 21E heavy barreled host gun with four position semi-automatic trigger pack, with an accompanying "All-Tech" registered three-position auto sear pack registered in .308 with additional configuration calibers .22 LR, .223, and 9mm documented on current registration form. This incredible H&K package is set-up to utilize either box magazine feed, or belt feed. Two barrels total are included, one is 15" and the other 17" long (measured by inserting cleaning rod in bore upon closed bolt). Other accessories included are two belt boxes, and two 30 round magazines, HK21E tripod adapter, spare barrel grip handle, "SEF" spare sear ready trigger box, and two spare ejectors, each for a different caliber (.223 & 9 mm). Host gun is set-up with a vertical foregrip, and bi-pod assy. Barrels are "quick-change" heavy barrels. Host gun marked on top of receiver "HK21EUG" with serial No. AU26589. Three position auto-sear pack is numbered 0053 on housing with registration information on sear box to ease identification. Overall appearance and finish upon manufacture is near mint exclusive of left side of feed tray which shows some bare metal area from use. Composite pieces also near mint. Belt boxes exhibit black enamel painted fishing with slight loss on finish at the attachment points of one box. Magazines are custom constructed from orig G3 magazines with markings visible under matte blue finish. Mechanics are crisp. Bores of both barrels are mirror bright and exhibit little if any use. THIS IS A NATIONAL FIREARMS ACT ITEM AND REQUIRES BATF APPROVAL PRIOR TO TRANSFER. THIS ITEM IS FULLY TRANSFERABLE ON AN ATF FORM 3 OR 4.