I have a 54 you're welcome to play with Mike, these use an identical action to the 56, and Nick is just having a fiddle with a 54 for the next Bash.
There's a bit of cost cutting with a few of the action components on these but the sledge system works well enough on them.
They're actually designed to run at 20+ Ftlbs and new ones are fitted with a transfer port restrictor for the UK market, but it's easy enough to fit a weaker spring and remove the restrictor for 12ftlb use --- there's no point cocking a 20ftlbs of Spring to get 12ftlbs out.