Zbroia Kozak FC 550 first range day

Just wanted to share some first targets with the Zbroia Kozak. Mounted the scope this morning and then headed to the range. Took a few shots to zero the scope and then I shot these targets. At 100 yards the JSB Diabolo 15.89 grain did the best for me. First impressions of the rifle are phenomenal. I'm sure these groups will tighten up once I get a few more tins sent downrange.
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Beautiful, compact, light and accurate..what’s not to like! Congratulations! Was at Joe Brancatto’s shop today and Rickie one of his workers had an Impact and a Kozak taken apart for tuning...they are built on a similar platform with the plenum tube situated behind the trigger and in front of the butt stock...a nice simple and tunable design.
 
Beautiful, compact, light and accurate..what’s not to like! Congratulations! Was at Joe Brancatto’s shop today and Rickie one of his workers had an Impact and a Kozak taken apart for tuning...they are built on a similar platform with the plenum tube situated behind the trigger and in front of the butt stock...a nice simple and tunable design.

Does it share the same issue with plenum volume insufficiency to support higher power as the impact does or have they added volume somewhere? 
 
Beautiful, compact, light and accurate..what’s not to like! Congratulations! Was at Joe Brancatto’s shop today and Rickie one of his workers had an Impact and a Kozak taken apart for tuning...they are built on a similar platform with the plenum tube situated behind the trigger and in front of the butt stock...a nice simple and tunable design.

that gun sounds like the Sapsan,, it has a plenum vol of 6.25" x .640 " ID