Looking for a stock regulator for a .25 caliber Taipan Veteran Bullpup. Bought it new in 2018. Got a Huma regulator for it and it won't work in my gun. I'd like to find one that hasn't been disassembled. I did a reseal on my gun and took the reg apart to replace o-rings. I shouldn't have done that. Any help would be greatly appreciated! I'm located in southwestern Pennsylvania. Thanks all!