Now All AR's are fired from the closed bolt position. I understand that the following description is what happens on an AR or C-7.
How do you get a slam fire from an AR? What has been modified to do that? What is driving the firing pin to hit the primer? The bolt has to be fully locked to allow the firing pin the engage the primer? Am I missing something?
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(1) Pulling the trigger rotates the sear and releases the hammer.
(2) The hammer strikes the firing pin and fires the cartridge.
(3) Gas pressure from the cartridge forces the operating rod and carrier rearward.
(4) The cam pin, following the cam in the carrier, rotates and unlocks the bolt.
(5) The case is extracted and the spring ejector ejects the spent cartridge through the opening in the ejection port.
(6) The action of the carrier moving rearward rotates the hammer downward to engage the automatic sear.'
(7) The forward travel of the operating mechanism engages the next cartridge in the magazine and chambers it.
(8) After locking and during the cam dwell, the sear release lever is moved forward by the carrier and releases the automatic sear, which in turn releases the hammer again.
(9) When the trigger is released, the disconnector rotates back to its original position and engages the hammer, stopping all action.
(10) In the Semi-automatic mode and on Semi-automatic model weapons the trigger must be pulled for each round that is fired.
The Bushmaster Weapons System (
http://www.biggerhammer.net/armpistol/manual/)