Well guns built on Aics mag platforms are capable of accepting mags that hold more than ten rounds. But mag changes are many times mandatory. Speed comes from muscle memory and Im pretty sure a seasoned PRS shooter utilizing the same platform gun will be more efficient and faster at a mag change than someone using a one of a kind JERRY rigged mag holder Bubbad on their gun. Sorry no pun intented. Well actually, it was!! Now thats funny and the truth. EDIT as Im sure some eloquent response will follow. Just wondering if its just me or has anyone noticed a direct relationship of running down only the things not sold by or able to make any money on!! Aftermarket 10/22 parts are where the problems arise according to someone. Other than barrels and Timney triggers, which just happen to be on his website, Heaven forbid an aftermarket receiver,bolt or trigger. Oh thats rite he doesnt sell any of those but continually runs down the precise cnc machined parts from not one, but all other manufacturers. States thats where all his problems begin. Callin BS on all of it and his findings. I find it incredible that of the guns Ive built with all the parts he says dont work that Ive never had any malfunction in any of mine. Guess im just lucky! I dont sell stuff for a living so my results are un biased. Ive shot many matches and I would like to hear of anyone whos seen a malfunction out of my gun with all the troublesome parts. You WONT !!! You will hear people comment on how accurate my rifle is. Not just with me the driver. Its the gun and Im the weak link in the chain.