With respect, that's not really an upgrade, it's just cosmetics. That won't improve the performance of your marker one bit. Unless you are looking to impress your mates at scenario games, theres not much point. The flatline barrel and stock works for some people, but just as many hate it and replace them at the first oppurtunity.
I'd suggest you upgrde by replacing the stock barrel with a freak or similar modular system, replace the power tube and front bolt, maybe add a drop forward and change to an air system and regulator. Replace the trigger frame with an e-grip or RT . Replace the stock hopper with a 230 round APP one
voila, quality marker! ( well , sort-of)
check out the Tippmann forums or the A-5 owners group for more ideas