The Open Bolt Autococker

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I made this thing.

This is a basic diagram of how my design works. There is no main spring or sear assembly. The back block moves forward instead of back so that when you pull the trigger, it actuates the ram forward and it contacts the nut closest to the body on the cocking rod. This pushes the hammer into the valve stem and opens the valve. The lpr adjuster knob must be replaced with a set screw, because it replaces the velocity adjuster. The ram forces the valve open momentarily, then the valve spring still closes it just like normal. The amount of time you hold the trigger down doesn't change the dwell. When you let go of the trigger, the back block moves back and a ball is chambered. The hammer is also moved back so that it has more kinetic energy on the way forward. The kinetic energy is the main reason why you can use a valve spring stronger than the force imparted to the hammer and not waste gas. The weight of the hammer forces the valve open because the kinetic energy of the ram plus the kinetic energy created by the speed and inertia of the hammer is greater than the strength of the valve spring. Then the kinetic energy created by the hammer's mass and speed changes into potential energy, so the only energy left is the energy from the ram, which is less than the strength of the valve spring, so the valve closes again even if the trigger is held back.

Pros of my design:

-Trigger doesn't have to be anything more than the length required to switch the 3-way.

-Friction from the sear rubbing against the trigger plate and the sear lug is removed (And you thought the roller sear was nice..... Try no sear at all)

Cons:

-If you believe the marketing garbage about closed bolt being more accurate and giving more range then this isn't for you.

-The gun gains the disadvantage of open bolt guns.... blowback MAY occur, but nowhere near what a spyder or a mag has, If you have a really long bolt, no blowback will occur at all. Delrin bolts are also beneficial because they don't have o-rings at the front that need to be in a specific place to create a seal. So long delrin bolts are cool.


	Jeff's Autococker Site \| home The Open Bolt Autococker \| Photo Album \| Favorite Links The Open Bolt Autococker I made this thing. This is a basic diagram of how my design works. There is no main spring or sear assembly. The back block moves forward instead of back so that when you pull the trigger, it actuates the ram forward and it contacts the nut closest to the body on the cocking rod. This pushes the hammer into the valve stem and opens the valve. The lpr adjuster knob must be replaced with a set screw, because it replaces the velocity adjuster. The ram forces the valve open momentarily, then the valve spring still closes it just like normal. The amount of time you hold the trigger down doesn't change the dwell. When you let go of the trigger, the back block moves back and a ball is chambered. The hammer is also moved back so that it has more kinetic energy on the way forward. The kinetic energy is the main reason why you can use a valve spring stronger than the force imparted to the hammer and not waste gas. The weight of the hammer forces the valve open because the kinetic energy of the ram plus the kinetic energy created by the speed and inertia of the hammer is greater than the strength of the valve spring. Then the kinetic energy created by the hammer's mass and speed changes into potential energy, so the only energy left is the energy from the ram, which is less than the strength of the valve spring, so the valve closes again even if the trigger is held back. Pros of my design: -Trigger doesn't have to be anything more than the length required to switch the 3-way. -Friction from the sear rubbing against the trigger plate and the sear lug is removed (And you thought the roller sear was nice..... Try no sear at all) Cons: -If you believe the marketing garbage about closed bolt being more accurate and giving more range then this isn't for you. -The gun gains the disadvantage of open bolt guns.... blowback MAY occur, but nowhere near what a spyder or a mag has, If you have a really long bolt, no blowback will occur at all. Delrin bolts are also beneficial because they don't have o-rings at the front that need to be in a specific place to create a seal. So long delrin bolts are cool.