20" Barrel 12 Gauge 5 Round Semi-Auto Shotgun, 3" Chambers, Flip Up Sights, 5 Choke Options, Bronze The G-Force GF2512 is a phenomenal option if you are looking for an extremely reliable and robust semi-automatic shotgun. This shotgun combines the ease-of-use ergonomics of the AR-15 platform with 12 gauge power. This multi-purpose shotgun is great to have on hand and is ideal for home defense, fun on the range, and even hunting! The 20" barrel has a 3" chamber and will function with a wide variety of 2 3/4 and 3" loads. This shotgun is fed from an AR-12 pattern detachable box magazine which makes reloads a breeze and it will accept all standard AR-12 MKA-1919 Pattern mags including the 10 Round mags and high capacity drums. ( We recommend our Defenceport line of mags and drums). Comes complete with a standard adjustable sight set so you will always be right on target. The polymer AR-style furniture includes a fixed stock with an adjustable comb allowing a custom fit for various shooters regardless of size. Carries a Limited Lifetime Warranty from G-Force Arms USA.