athomas
02-27-2002, 01:38 PM
One of the main concerns of the automag guns is the amount of blowback causing feed problems. Airgun Designs has addressed this problem quite successfully using longnose bolts and powerfeed bodies. I was wondering what the effect of reducing the bolt spring tension would be.
The automag bolt spring tension is a value that causes the bolt to return to its open position (valve closed) with approximately 50-60 psi of residual air still in the chamber. This also means that there is a fair amount of air pressure still in the barrel as well. It is this air that expands in both direction to follow the ball out the barrel plus blow back up the feed tube. By reducing the spring tension, maybe the chamber pressure would cause the bolt to stay forward longer lowering the residual pressure available to cause blowback problems.
A shorter spring due to wear causes bolt stick problems. Would a proper length spring at a lower tension work? In theory it would, but in reality I not entirely sure.
Is it the pressure in the chamber that keeps the bolt forward after the initial push, or is it the time it takes the spring to rebound and push the bolt back to its open position that ultimately determines the bolt cycle time?
Lets get some discussion on this topic.
The automag bolt spring tension is a value that causes the bolt to return to its open position (valve closed) with approximately 50-60 psi of residual air still in the chamber. This also means that there is a fair amount of air pressure still in the barrel as well. It is this air that expands in both direction to follow the ball out the barrel plus blow back up the feed tube. By reducing the spring tension, maybe the chamber pressure would cause the bolt to stay forward longer lowering the residual pressure available to cause blowback problems.
A shorter spring due to wear causes bolt stick problems. Would a proper length spring at a lower tension work? In theory it would, but in reality I not entirely sure.
Is it the pressure in the chamber that keeps the bolt forward after the initial push, or is it the time it takes the spring to rebound and push the bolt back to its open position that ultimately determines the bolt cycle time?
Lets get some discussion on this topic.