Saw one and was curious if anyone has checked them out:
http://www.atlanticfirearms.com/images/easyblog_shared/mkablogtn2.jpg
MKA 1919 Shotgun 12 Gauge AR15 Style shotgun made in Turkey
These are the newest generation of MKA 1919 shotguns Marked XN and come with 2 -5 round factory mags and choke tubes.
Akdal MKA 1919 semi-automatic shotgun is the new product from Turkish company Akdal Arms. This weapon is intended for civilian and security use, and mimics the famous M16 rifle in its layout and placement of most controls. It is remarkably light for its caliber and size, because of extensive use of modern, high strength plastics.
Akdal MKA 1919 semi-automatic shotgun utilizes conventional gas-operated action with annual (ring-type) gas piston, which is located around the support tube that runs below the barrel. Return spring is also located around the same tube, which is concealed by enlarged polymer handguards. Barrel is quick-removable from upper receiver, barrel locking is achieved by tilting locking piece inside the bolt, which engages the barrel extension. Charging handle is attached to the bolt and projects on the right side of the receiver. The upper receiver is manufactured from aluminum alloy; lower receiver, along with pistol grip and shoulder stock, is manufactured as one piece from impact-resistant polymer. Akdal MKA 1919 semi-automatic shotgun utilizes detachable box magazines, each holding 5 rounds; an M16-style bolt stop and bolt release button are incorporated into the lower receiver. Manual safety also duplicates M16-style, being located on the left side of the receiver, above the pistol grip. Standard sights include front post, installed on the M16-style removable base, and a detachable M16A2-style carrying handle with built-in diopter sight.