The MP18,I, the first practical submachine gun, weighed 9.31 lbs and had an overall length of 32 inches, utilizing a 32-round drum magazine. Its open-bolt operation and side-mounted magazine created significant torque, requiring specific handling techniques. While recoil from the 9x19mm cartridge was minimal, the heavy bolt mass hindered precision fire, especially with its 200m maximum sight.
The MP 18,I, the first submachine gun in WWI, weighs 9.3 lbs and is 32 inches long. It utilizes a 32-round Luger Trommel magazine, which causes a left-side weight bias. Operating from an open bolt, it features a single-stage, fully automatic trigger. While recoil is minimal with 9mm, the heavy bolt mass impacts precision, and its sights are designed for short-range suppressive fire.
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