The antichop works by using a spring to let the nose of the bolt stop even though the striker and back/inside core of the ACS bolt keeps coming forward. When the ACS bolt spring is soft enough it'll let this all happen and still let the marker recock to fire the pinched ball on the next firing cycle. When the bolts are new they sometimes chop anyhow because the spring is too stiff. Spyder gurus recomend removing the bolt and "exercising" it by collapsing the bolt and letting it spring back while watching TV or something. It takes a few thousand compression cycles to soften it up but when it works it works well. When it doesn't it may as well be a one piece bolt.
I had a "Paintball God" moment once.
Like Al Bundy's Polk High football moment I live on
for the slim chance of repeating that one time
miracle in some small way.........