It's a 69 Brno mod 2 with a stainless 20 cal barrel that fire's standard 22lr.
Here is a link with some info for those that have never heard about it: http://shootingwithhobie.blogspot.com.a ... e.html?m=1
Unfortunately my old phone shit itself so I lost all my photo's of testing etc.
I haven't done a huge amount of testing but was getting some clover leaf groups with the SK standard velocity and cci stinger ammo at 50m.
This rifle has 3 action screws instead of the original 1. The back one is used to finely tune the gun to the ammo.
It definitely works as I had some CCI standards that shot poorly and then they shot acceptable with some adjustment.
I plan to shoot a bunch of the high velocity ammo and see what happens.
Speeds increased anywhere from 40-100fps depending on the ammo. I shot them side by side with another mod 2 for reference. Some of the stingers were hitting 1750fps so they were definitely scooting along.
Cheers
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