DSDM Try changing the o-rings in the breech. take them out of your old one and put them in your new one.
i tried this, but i had a real hard time getting to the one nearest the feedneck (w/feedneck removed) as this would be the one causing the trouble. is there an easy way to remove that o-ring from the breech?
update: i removed the ball detents and the bolt cycled fine when in rapid fire, but if single firing it still had some trouble - this was a great improvement from before. this is telling me that the bolt is running into too much resistance in the breech. maybe need newer detents? and replace the o-rings?
or how about this: does anyone know where to find a cheap *** breech for an older ('05) ION?