Firearm purchases require a background check and must be picked up in person by the purchaser
SBR transfers will not be accepted 
A Western Field XNH-560-8A 12 gauge shotgun is a standard 12 gauge shotgun, meaning it has a bore diameter of approximately 0.729 inches (18.5mm) and is designed to fire 12 gauge shotgun shells, with typical specifications including:: 
Gauge: 12 gauge 
Chamber size: Most likely a standard 2.75 inch chamber 
Barrel length: Variable depending on the specific model, but usually around 18-20 inches for a pump action shotgun
Overall length: Varies depending on stock length and barrel length
Action: Pump action (most likely)
Choke: May come with a variety of choke options, including modified, improved cylinder, or full choke 
Important points to remember:
Check your specific model:
Always consult the manual or manufacturer's website for exact specifications of your Western Field XNH-560-8A shotgun as features may vary slightly between models. 
Ammunition compatibility:
A standard 12 gauge shotgun can fire a variety of 12 gauge shells, including birdshot, buckshot, and slugs.