Spinning Bolt

[jackssmirkingrevenge]

Thanks. I completely forgot about having a ball stopper.

*fights urge to dispense not-so-subtle innuendo... nah, it's too easy*

[SPG]

Although of course you'd like it to stop with the port not completely open to the magazine, or all your projectiles will roll out the barrel.

An o-ring would not only prevent this but also allow pressure buildup before the projectile fires, increasing power

And now we're back to modded ball valves rotating perpendicular to the barrel axis, which solves all the problems in one go.