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Old September 11, 2011, 06:40 PM   #74
Stephanie B
Senior Member
Join Date: March 1, 2008
Location: NWern SE Missouri
Posts: 337
Yes, but you're not talking about a delayed blowback or short recoil action. You're mulling over a gas piston. Isn't it going to depend on how much gas you allow into the piston's expansion chamber?

For instance, I have an adjustable gas port on my Garand. I can set that between "all of the gas into the expansion chamber works the operating rod" to "it all gets vented out and the operating rod doesn't budge".

You've got the mass of the arbor/piston, the mass of the hammer, the rotational mass of the cylinder and the resistance of the mainspring, all working against the gas coming into the piston. The key would be to just admit a little bit, just enough to move the hammer back to full cock.

Downside is that once you figure out how to do all that, you're kind of limited to one level of power for your loads, as increasing power would slam the beejeez out of the gun and decreasing power would mean the hammer didn't go all the way back. Not sure where you could install a coil spring to slow down the piston if you wanted to.

Nice mental exercise, but maybe there is a reason why self-cocking revolvers haven't been practical.
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