20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called "guns", from larger-caliber "cannons" (e.g. machine gun vs. autocannon), is conventionally taken to be the 20 mm round, the smallest caliber of …

The Oerlikon 20 mm cannon is a series of autocannons based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II. Many versions of the cannon are still used. [2][3]

The Anzio 20mm rifle[1] is an American anti-materiel rifle designed and marketed by Anzio Iron Works. It is the first American anti-materiel rifle designed and mass-produced for public sale with a bore diameter in excess of .50 caliber in over 80 years. [2] .

Available in 14.5mm, 20mm, and new Anzio 20-50 calibers; Titanium firing pin; 5000 yard maximum range; Optional weights and configurations; Huge amounts of fun ; Low recoil; CALL FOR DETAILS

Widely used by many nations, this 20 mm automatic weapon originally designed by the Swiss firm of Oerlikon was probably produced in higher numbers than any other AA weapon of World War II. In 1937 the British Admiralty initiated tests to find a weapon suitable for arming merchant ships and minor warships against close range air attacks.

2019年3月7日 · Available supported armament, ammunition, and special-mission equipment featured in the design of the Oerlikon 20mm Air Defense Gun / Aircraft Gun / Towed Anti-Aircraft Gun. Variable - single, twin, and quadruple mountings available.

火炮的技术途径是利用口径大于等于20mm的半封闭的身管来实现抛射弹丸的目的。 火炮的功能，是赋予弹丸准确地飞向目标所需的初始速度和初始方向。 定义火炮口径大于等于20mm基于两点缘由，其一是炮膛面积正比于火炮口径的平方，在发射过程中，火药燃气推动弹丸向前运动的同时，向后作用于膛底，作用力正比于炮膛面积，亦即正比于火炮口径的平方，随着口径增大炮膛合力大大增大，后坐阻力也就大大增大；其二是弹丸体积及质量正比于火炮口径的立方，弹丸威力 …

20 x 102 mm round with . 50 BMG rounds, golf ball, stick of RAM. Like most cannon ammunition, 20mm caliber weapons are typically used against large targets such as vehicles, buildings, or aircraft. Though lethal against individual soldiers, 20mm ammunition is so large and heavy that its effects are inefficiently utilized on such relatively ...

The 20mm M-197 produced by General Dynamics Ordnance and Tactical Systems is a lightweight, three-barrel version of the M61A1 Gatling gun intended for applications that require a lightweight, highly reliable weapon capable of firing up to 1,500 shots per minute.

The 20 mm AA Machine Cannon M/38 was a 20 mm rapid fire autocannon produced by the Danish company Dansk Industri Syndikat (DISA). The gun, which could be adapted to several tactical uses, was a primary weapon of the military of Denmark. It was also exported to numerous countries around the world because of its versatility.