[Hectic]

I have to dissagree my tsd sd700 started to slam fire quickly as well. If u would rotate the piston it would work for a while then slam fire again if u feel around the lip of the piston u could feel flat spots on it causing it to slip off the sear. Changing the piston to the pss one fixed the issue for a while till the pot metao sear wore down then i went stainless sear fo match the stainless piston lip. Been runin 512fps (pss sp150 spring) for a few years. Probably 1000 rounds or mors with no issue at all. Also using teflon coated cylender stock cylender head and spring guide pss10 airseal chamber custom nub stock rubber
Arktic did u try using the whole bolt set up from the vsr to see how it fits?