I couldn't let y'all have all the fun so I picked one of these up over labor day weekend. Great little plinker! Of course I couldn't leave it alone... had to open it up and start messing with stuff.
Looked like it needed some porting... so I opened up the barrel, body, and valve body to 4.2mm. Also opened up that tiny hole between the plenum and valve... I don't know the size exactly but maybe 6mm. Deburring the sharp edges was basically brain surgery... but It worked out with no damage.
Some eNgInEeR decided to put an oddball extra tiny oring on the barrel... along with sharp edges to cut them. That was nice. I just machined the grooves in the barrel to accept a 1x10 oring, rather than find a source, pay too much, and wait days for replacements.
Results. I did not touch the reg, and the hammer spring is exactly back where it was. 20% more FPE! Nice! That was worth the effort.
Stock:
After porting:
Hmm... what to do next...
Edit: chrono numbers are Jsb 15.9gr
Looked like it needed some porting... so I opened up the barrel, body, and valve body to 4.2mm. Also opened up that tiny hole between the plenum and valve... I don't know the size exactly but maybe 6mm. Deburring the sharp edges was basically brain surgery... but It worked out with no damage.
Some eNgInEeR decided to put an oddball extra tiny oring on the barrel... along with sharp edges to cut them. That was nice. I just machined the grooves in the barrel to accept a 1x10 oring, rather than find a source, pay too much, and wait days for replacements.
Results. I did not touch the reg, and the hammer spring is exactly back where it was. 20% more FPE! Nice! That was worth the effort.
Stock:
After porting:
Hmm... what to do next...
Edit: chrono numbers are Jsb 15.9gr
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