This would be cool. I see references to a lot of new items on the market, since I've been on hiatus.
Today, I would drill out the valve throat a bit, and bush the valve stem hole down to 1/8" and fit an MRod poppet, along with a PRod gauge port.... but I don't have the documentation so nicely presented to show how that would tie in with the original mods I did.... That is simply one more way to achieve similar results.... In practical terms, for a .22 cal Disco, I'm pretty happy with it tuned to shoot 18 gr. JSBs at 960 fps....Bob
My results were good after following Bob's advice but I am averaging 832 fps with JSB 18.13 jumbo exact heavy for right at 28 fpe over a 20 shot string. I have a stock spring with a power adjuster, stainless steel fluted hammer and stainless steel hammer pin. Where I made the most gains was the transfer port. The stock port that comes with the BNM multi shot breech is already large enough in diameter to increase the airflow. I fill to 2300 psi (I have the upgraded valve screws) and shoot down to 1500 psi.
Quote from: Lmgunner13 on June 06, 2017, 03:00:27 PMMy results were good after following Bob's advice but I am averaging 832 fps with JSB 18.13 jumbo exact heavy for right at 28 fpe over a 20 shot string. I have a stock spring with a power adjuster, stainless steel fluted hammer and stainless steel hammer pin. Where I made the most gains was the transfer port. The stock port that comes with the BNM multi shot breech is already large enough in diameter to increase the airflow. I fill to 2300 psi (I have the upgraded valve screws) and shoot down to 1500 psi.Hey Phil, That's looking good indeed - and simple! Such a great way to start.. Do you know that the diameter of your transfer port is?