I have the BFSIII and love it. I also installed the HBIspring kit on it. Couple things though, first, the trigger feel is the same as the stock trigger with the HBI spring. Second, the AK safety I very much liked does not work with the binary trigger as it hits the receiver and won’t go into the third position.
Might I suggest the Ascalon Arms trigger pack. It’s raved about by the one guy I know who has it. I know Ascalon is in the Czech Republic but their website is great and their costumer service is great. Jiri speaks and writes excellent English. I’ve ordered several parts and received them all in 7-10 days. No, I have no relationship with them, just a couple good experiences.
Btw, their receiver shim might be the best 23$ shipped I spent on my scorpion.
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