This listing is for a Mossberg SSI-One chambered in .223 with an additional 12 gauge barrel. This was a receiver system manufactured by mossberg to compete with TC encores. They were only produced for a limited amount of time creating a cult following with the their performance. The barrel on the gun is a 24" heavy varmint in .223. The 12 gauge barrel comes in the original box. The barrel is a 24" turkey configuration with porting and an interchangable choke. Overall the firearm is in great condition with limited signs of wear. Mounted on top is a Bushnell 3-9 optic.