A friend of mine "back in the day" who played on our team (Total Confusion) tested a drop in semi kit for Scorpion.
It was just a copy of AGD's valve tbh, but with enough changes to avoid future law issues! If I remember rightly it fitted Phantoms and a host of others too.
When it worked it was fantastic, but it never worked for a full game lol.
If HPA was available back in 91/92 it would have worked well, it would just freeze and lock up as soon as the Co2 vapour built up, and if you got liquid in it, it would need a complete strip down and new seals!!
We were trying to negotiate a support deal and were going to run 10 of them, but ended up just getting Lev3 mags and early cockers..... and the fool who opted for a Golden Eagle
I have lost contact with the guy, But IF I do ever bump into him the conversation will be like
" Hey, how have you been, its been what... 15 years"
"btw, you still got that scorpion semi kit? "