The barrel needs a freak insert, and you need a donor Crossman air pistol such as this:
I can’t remember where I got that from. Check the suitable models in the Sellswords information on each kit then look around UK country sports retailers etc
In the current world climate it will take a bit longer to arrive and factor in Import VAT & customs handling on top of the bill
Watch his videos on building them. You do need to do some modifying to the airpistol, grinding down a catch etc and it’s very easy to think you’ve done enough.
I cracked my first kit being too impatient, so ended up getting another.
It’s pointless, expensiveunder powered and out gunned.
It’s a stupid idea
I've got the fs fsc. Seems brilliant and accurate only down fall I'd say is additional parts for strike force currently are lacking and any mods wanting to attach to rails its to short as compact plus only 8g co2 . But for reliability and accuracy really enjoy it.