So what kind of groups are you getting right now?
First thing (obviously) is to get the barrel free-floated as that's messing with the barrel harmonics. No sense in making a barrel tuner until you have that sorted out.
Second, are you shooting standard or high velocity ammunition? It's bee my experience that high velocity ammo never groups well no matter what gun I run it though. I'm sure there are a few exceptions out there, but I've yet to find one.
Third, check your action screws. During my testing of the B17 FV-SR earlier this summer my accuracy suddenly tapered off and I found the cause to be that the front action screw had shot loose on me. Tightened it up and she started shooting nice small groups again. And before you ask, no I don't have a torque value - I just go by feel.
Last but not least, remember we're dealing with 22 rimfire ammo here. 1/2" groups at 50 yards are very hard to come by with a factory rimfire rifle no matter how good the ammo is, and such groups aren't a given for custom rimfire rifles fitted with premium aftermarket barrels either. Generally speaking, if you get a factory mass produced rimfire that consistently shoots under an inch you have a good one. If you have one that consistently shoots under 3/4" you have a great one. If you have one that consistently shoots 1/2" or better groups you found a unicorn.
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