Yeah its like a Spyder with a new bolt system. With the ACT there are 2 sections in the bolt(front and back) and what happens when the front bolt recieves resistance from the a ball being stuck it doesn't move the front bolt piece forward causing no chop,but the back bolt continues the cycle.
Pretty good looking system Tippmann has going I just wonder how it truely preform.
I didn't explain it all too well but here is a link to Tippmann's site that shows you how it works.
http://www.tippmann.com/product_guide/actTechnology.aspx 
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