The M110 spring seems to be a bit of a bust. Getting 270 fps@ 600rpm now. I will try the M130 and if it comes in around 350 I'll probably keep it.
I'll also have to recheck the airseals and make sure I'm not losing soemthing there.
I broke my bolt catch, the metal is very brittle and thin on the inside where it connects to the catch rod with a screw. The stock adapter plate was cracked in 3 spots, so I'll be replacing it with a KA one I found that should fit with my full stock.
My magazine catch is a PITA because it screws off and you can't really do it without removing the bolt catch, so I ordered an after market one with a screw holding the assembly together.
To be continued...