1720T bstaley tune for 12fpe field target use

[screwwork]

What is the stock LW .177 barrel port ID?

Thx Randy

[Frank in Fairfield]

I used four o-rings and a standard (not drilled out) PRod TP
Using a 7.33 grain JSB Exact, these are my results:


This was a 50 foot rifle GTA target earlier this year.
I was the only one using a pistol:



Here is the item in question:

[moorepower]

The square o-rings do not move in the tube, no need to put anything on them.

[FuzzyGrub]

What is the stock LW .177 barrel port ID?

The one I have off right now, measures 0.130", but I might have opened it up in the past.

[travelbike]

I think the pistol comes with the green port installed at .07. There;s a red one in the box at .05. I drilled oversize the red one to .09.

At .09, 10.8 gr is 710 fps,  8.3 gr is 780 fps.