BudsGunShop.com - 3" Chamber

Joseph - has a 3 inch chamber. Can fire 3" shells, or shorter ones. No 3 1/2" magnums though.

Joseph, this shotgun has a 3 inch chamber and will fire any 12Ga shells that are 3 inches or shorter.

It is a 3 inch chamber and will work just fine with both 2 3/4 and 3 inch shells Shotgun - Cal. 12 ga.
Barrel Length - 18 1/2"
Overall Length - 29 1/2"
Weight w/Empty Magazine - 9 lbs.
Self Adjusted Gas System
Upper Receiver - 7075 Aluminum including full integral picatinny rails
Lower impact resistant polymer w/Ergonomic Grip
Bolt - Chrome Moly
Recoil Pad
Adjustable Cheek Pad
Completely Ambidextrous - Safety Lever, Mag Release, Two Cocking Handles to Operate three ways, Up - Left - Right
Receiver/frame is thicker than similar Shotguns on the market.
Trigger parts are machined from solid stock, not investment cast
Magazines are designed to work with both 2 3/4 and 3-inch shells
Gas system is self-adjusted to any shell Both Low and HI Brass. Spring and buffer system can handle high powered shells with no problem
AR12 has ergonomic grips and cheek rest very comfortable feel .
Rails built into the handguard for easy mounting of optics/sights. No need to buy expensive aftermarket rails.

Joseph, Chamber and magazines are chambered for up to 3" shells. If your shoulder can handle the 3" rounds the firearm can.