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Discussion Starter · #1 ·
Hi everyone, I'm sure you guys can answer this questions for
me. On full autos what determines their rate of fire? I mean why
some machine guns can shoot 900rpm and some shoot 600rpm?
Sorry if its dum question but I would like to know.
 

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Why is the sky blue?
Why is water wet?
Why?

There are MANY things that determine the cyclic rate of fire on a machine gun. So there is no one right answer. Other than they were designed to fire at that rate.
 

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Springs, speed of gases, length of certain parts, angles of parts that pivot or rotate, etc etc.
Weight of said parts plays a big factor. Look at an M3 'grease gun'...shoots fast pointed at 90* (3/9 o'clock), faster at 180*(6 o'clock), slower at 0* (12 o'clock). Some weapons have rate reducers to prolong barrel life. heat kills a barrel....design, open bolt fixed firing pin guns shoot faster than hammer fired guns.
 
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