My pmr-30 was a first generation with a slick grip and fluted barrel. This barrel did keyhole badly with cci and barrel was replaced within a week of buying...+1 on customer service.
Replacement barrel always shot "Paper plate moa" and was never all that spectacular albeit incredibly reliable...More so than my 1911, I might add.
Fast forward 6 yrs... Fredderson claims to have a great new barrel and I jump on it for $45. Accuracy is only nominally better... It's not even worth the $45.
After a broken firing pin, I shipped back to the factory and got a complete upgrade on my pmr.... +1
I now only have armscor 22 wmr ammo for the foreseeable future and it is not recommended... So why not shoot non recommend ammo in a non recommended barrel?
Here are my results.... Original fluted barrel armscor 22 wmr, 10 yrds offhand...