Octane 9 causing cycling problems?

[Butcher]

I finally tested my new can on my CZ P-07 and P-09. I experienced a problem with the 09 that never happened in the 07... The slide would lock back every 2-5 rounds. I checked and double checked my left thumb placement and it definitely wasn't pushing up on the slide lock lever. Tried shooting one handed and let another shooter try it. Same results. Dunno what's going on. The P-07 "tactical" variant came with threaded barrel and suppressor sights. The P-09 has standard sights and I added the threaded barrel after the fact (it's CZ-made). Any ideas why the gun / suppressor is doing this?

 

[IgotAgun]

Hmm. You might have to adjust the recoil spring for suppressed shooting. I would assume to a higher weight, but I could be wrong.