The Glock 20 is a pistol manufactured by the Austrian company, Glock. The G20 is a standard frame Glock, approximately 7 mm longer and 2.5 mm wider than the common Glock 17.
The Glock 20 is chambered to fire 10 mm Auto ammunition. 10 mm auto is consistently considered one of the most powerful handgun rounds most commonly used in autopistols. The G20 is popular with some steel plate shooters and is also carried by some police departments.
Like all Glock pistols, the Glock 20 has much of the same internals as the Glock 17, but all of the internal parts have been modified to fire the 10 mm Auto ammunition.
The Glock 20 has been through two major revisions since its inception and current models are referred to as 3rd generation Glock 20s.