"Steve W."
Bolt speed doesn't make a difference in this
area. The hammer would still ride it down
without enough force to set off the primer.

The hands down easiest auto to make would be an
open bolt design. On those the firing pin is
fixed on the bolt face. You cock it by pulling
the bolt back and latching it on the sear. When
you pull the trigger the spring slams the bolt
forward, as it moves it strips a round out of
the magazine, chambers it and just as the bolt
closes the firing pin hits the primer and the
round fires. The recoil slams the bolt back to
repeat the cycle. The cyclic rate is VERY high.
You can slow it down using heavier bolt weight,
gas porting to bleed off some pressure and
playing with the spring weights.

The easiest "conversion" candidate would be a
blowback operated action.
Not much to do to get them to work.

--
Steve W.


This sounds like the 20mm cannons on the A-1
Skyraider! I spent
a year loading these and it was always exciting
reloading these
cannons. If the bolt sear pin breaks off when
charging the bolt the
cannon runs till empty... only way to stop it when
you charge it
is to jam a screwdriver through the belt....
quickly .. The safety
was put in after the bolt was charged. Then it
was up to the
guys on the arming pad to deal with taking it out.
;)}
pdk