I'm figuring you are after max fps airgun. The only advice I can give you is the Airforce Texan Frame is already maxed out in stock configuration. I have a 50 TX2 valve 34 inch barrel. It can shoot 650 grain boat tails at 750 fps.460 grain 860 fps. My Texan actually wore out the pin going through the sear, recoil and I actually shoot my Texan alot!!! Yes I want more performance, who doesn't. I'm not even sure if My Texan would hold up with the 50 African Air Ordinance 4500 psi upgrade. Nothing negative about African Air Ordinance, just having reliability issues from current power levels. I'm halfway ready for 4500 psi fills. I have a 5500 psi Scott Scba tank and my regulator good.to 7000 psi. I'm currently running yong heng compressor ....I desperately need to upgrade. So.when I do get funds ill buy a booster pump. 4500 psi every shot, easy peasy. I've been 3 years in collecting the tools too shoot 4500 psi tethered. I'm halfway there. Hope this helps you
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