ATI S-Beam MB3-R 12-Ga 18.5" Barrel
Updated September 23, 2026
This auction ended on September 27, 2026.
See upcoming auctions from Trigger Shack Llc..
| Lot number | 458 |
| Auction | Trigger Shack American Gun Co. |
| Date | September 27, 2026 at 10:00 AM EDT |
| Auction house | Trigger Shack Llc. |
| Location | Bucks County, Pennsylvania |
ATI S-Beam MB3-R 12-Gauge Pump-Action Shotgun — 18.5" Barrel The MB3-R is a rugged, defensive-style pump-action shotgun featuring a steel receiver, black synthetic furniture, and compatibility with many Remington 870 components. Specifications: Manufacturer: ATI / S-Beam Precision Products Model: MB3-R Series: R Gauge: 12 Gauge Action: Pump Action Capacity: 4+1 Barrel: 18.5" Smooth Bore Chamber: 3" Overall Length: 39.25" Receiver: Blued Steel Metal Finish: Black Stock: Fixed Black Synthetic Front Sight: Blade Safety: Manual Trigger: Standard Hand Orientation: Right Weight: 8 lbs. Remington 870 Parts Compatible Manufacturer Number: ATIGMB3R UPC: 813393019913 Condition: New
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