Having put new tech t spring delrin bolt drop forward empire on off asa carbon fibre night stick barrel and love kills grips on my mini invert. I can safely say no it still shoots about the same and that little lot listed cost me in excess off 200 quid. Couple that with the 280 it cost new. That's 480 you can get a second hand high end marker for that I know as I have just brought an ego11 for 380. Don't get me wrong the mini is an awesome little gun and I love it. But I would save the money you are going to spend on upgrading and buy a secondhand high end marker. Hope this helps