Pneu-Dart Model 178B air-powered dart projector manufactured on Benjamin Sheridan action. .50 caliber smooth bore barrel, 41" overall length, open sights, 7 lbs. Multi-pump pneumatic operation with adjustable power control knob, minimum 1 pump, maximum 10 pumps. Effective range 5 to 40 yards with Type 'P' disposable dart devices. Serial number 207500362. Condition good with minimal use. Manufactured by Pneu-Dart, Inc. of Williamsport, Pennsylvania, with guns and parts built on Benjamin/Crosman action. Used for wildlife immobilization, veterinary applications, and livestock management. No firearms license required. No darts included. A practical and specialized air-powered projector with legitimate professional and sporting applications. 

Make Manufactured for PNEU-DART By Benjamin Sheridan
Model 178B
Serial Number S/N: 207500362