going through old threads, these new carbs are adustable!! there is a small cylinder shaped hole that dead ends on the carb. you either need to drill it until it breaks through or there is a rubber cap you need to pry out. once you do, walla, you adjustment screw is awaiting your commands. it is very small though, you may need to file down your smaller screwdriver to fit in it.
20 years total service, Full Time since 03'
Sig Sauer Sercurity