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Old May 9, 2021, 07:53 AM   #26
Join Date: February 12, 2001
Location: DFW Area
Posts: 23,630
SO you have to understand the context when someone uses the term RPM.
Indeed. Fortunately the OP's context is quite clear--the question is obviously about cyclic rate.
What controls the rate of fire on an automatic weapon, bullet weight, recoil spring tension???
It depends on the type of action, to begin with.

The cyclic rate of a gas-operated gun can be increased by allowing more gas into the action. That's assuming the action is designed to handle it.

In a recoil operated gun, lightening the recoiling mass will generally increase the cyclic rate, depending on how the locking mechanism is set up. And, again, assuming the action is designed to handle the extra energy of the recoiling mass.

I think asking about one specific gun might net some more useful responses. I think asking the general question opens things up so wide that it's hard to give a good answer.
Do you know about the TEXAS State Rifle Association?
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Old May 11, 2021, 01:47 PM   #27
44 AMP
Join Date: March 11, 2006
Location: Upper US
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It depends on the type of action, to begin with.
Often it ends with the type of action, as well.

Sometimes, increasing the gas doesn't result in any appreciable change to the cycling rate it just makes the parts slam harder. Yes its because they are moving faster but the result is dependent on the specific action particulars.

Adjustable gas systems on some belt fed guns are there to provide more gas to keep the action running when it becomes sluggish due to the build up of heat, firing residue, loss of lube or foreign matter found in combat conditions.

Other "adustable" systems are not firing point adjustable, requiring changes in buffers and/ or springs or other parts to change the firing rate.

How much can be changed and how it is done is entirely dependent on the design of the action. There's no free lunch.
All else being equal (and it almost never is) bigger bullets tend to work better.
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