R9 receiver compression area reduction, and other silly schemes!

[nced]

I bored and machined a straight/concentric sleeve for my R9 receiver like this.......


Then turned the OD for a slip fit to the degreased R9 receiver and super glued it in place like this.......


I'll be making a custom piston to fit the sleeve and the intention is to make a "hybrid piston" with a screw in latch rod, a piston head that's threaded into the piston shell, and I'm planning to try a turned "TX style" latch rod catch to see of it will work. A while back I made a couple extended latch rods for a TX200 owner so I tested the fir of the TX200 catch with my Rekord trigger and here is a pic.........


Anywhoo.....if all this works out the reduction in receiver diameter in the compression area will eliminate the current issues I have when trying to push an oring sealed R9 piston past all those knockouts, dowel holes and slot without chipping the compressed oring!

[Bryan Heimann]

Seems like your'e loosing a lot of swept volume that way...

[nced]

Seems like your'e loosing a lot of swept volume that way...

Yep......but I've oring sealed a couple TX200s and found that the compression tube of the TX at about 25mm is also smaller than the R9 receiver at 26mm and I noticed that the TX200 still put out respectable velocity.

Keep in mind that the smaller custom piston would also have a lighter weight so if the weight reduction of my current R9 piston coupled with replacing my .400 thick oring sealed piston cap with the more recent .500 thick cap, and the velocity actually INCREASED, I'm guessing that "rules are indeed made to be broken" SOMETIMES. Anywhoo...........with oring sealed piston caps in my R9 EXCESS velocity is the issue so some velocity drop would be fine as long as it was 11+fpe.

Over the years I've learned that there are a lot of unspoken LAWS in airgunning, however achieving the goals of the individual shooter is the controlling factor. Not everyone is interested in max velocity...........if I were then I'd tune my oring sealed R9 to shoot CPLs in excess of 960fps (been there/done that).