Panzer Arms FS1 Pro Gray/Walnut 20-inch Folding 12 Gauge Shotgun The Panzer Arms FS1 Pro Gray/Walnut is a folding 12 gauge shotgun with a 20-inch barrel and a 3-inch chamber. This version combines the Gray/Walnut finish configuration with a Mobile choke system and M-LOK attachment features. The Gray/Walnut configuration is offered with a stated 5-round capacity. The folding design is a central feature for buyers considering storage and transport alongside the barrel and chamber specifications. Shop the FS1 Pro Gray/Walnut at BattleHawk Armory. 20-inch Barrel and 3-inch Chamber The barrel measures 20 inches, and the chamber is specified at 3 inches. Those dimensions identify the barrel and chamber separately; they should remain central when selecting the correct ammunition for the firearm. Folding Configuration and Choke System The FS1 Pro folding design supports a more compact arrangement for storage and transport. Its Mobile choke system provides choke selection as part of the shotgun configuration. Follow the firearm and choke instructions when pairing ammunition with choke equipment. Gray/Walnut Configuration with M-LOK The Gray/Walnut combination gives this FS1 Pro a wood-accented appearance. M-LOK identifies the accessory interface feature on this version. Choose accessories with appropriate mounting hardware and clearance rather than assuming universal fit. Product Specifications Brand: Panzer Arms Model: FS1 Pro UPC: 869325001235 Product Type: Folding shotgun Gauge: 12 Gauge Barrel Length: 20 inches Chamber: 3 inches Capacity: 5 rounds Finish: Gray/Walnut Choke System: Mobile Accessory Interface: M-LOK Frequently Asked Questions What is the barrel length? The barrel is 20 inches long. What chamber length is specified? The FS1 Pro has a 3-inch chamber. What is the capacity? This configuration has a stated 5-round capacity. Does this shotgun fold? Yes. Folding is part of the FS1 Pro configuration. What distinguishes this version? This version combines Gray/Walnut styling with M-LOK and a Mobile choke system. Purchase the FS1 Pro Gray/Walnut at BattleHawk Armory. Explore Panzer Arms at BattleHawk Armory for more from the brand.