The AR-Shotgun is gas operated and features 18.50" with 3 chokes. I also has a folding front & rear sights, sling swivel, and comes with two 5-round and one 2-round magazines. 

Landor Arms LDLND1171218 AR-Shotgun 12 Gauge 18.50" 5+1,2+1 Black Black Synthetic Stock Right Hand, New in Box

 Sahuarita Guns | Landor Arms LDLND1171218 AR-Shotgun 12 Gauge 18.50" 5+1,2+1 Black Black Synthetic Stock Right Hand