redlightrich
New member
Hello all, as I tune my 22lr auto pistols, I wonder about the effect of lowering hammer and recoil spring spec.
On a locked breach, the unlocking occurs when the pressure reduces to a pre-determined amount. Any change in recoil or MS weight may effect the opening time.
Switching gears, on a blowback, when using a lower power MS and or recoil spring, can that serve to slow or speed the slide/bolt? Can it allow the slide to begin it's rearward travel BEFORE the round built its full power?
My "experiment" uses 2 very similar pistols, A CZ PCR (75d Compact) and a CZ 75B, both have their own dedicated Kadet kit installed. A Kadet kit, converts a centerfire pistol to 22lr caliber. It is a full system.
I can't swap these kits, as the rail is a bit wider on the PCR, which takes the Kadet kit without any fitting. The PCR kit will not install on the 75b. The 75b will work on the PCR, although the barrel assembly is noticeably loose. being that kit was fit to the 75b frame.
The PCR using a 17# MS and a "cut" recoil spring ( 1.5 coils cut off) struggles to cycle SV ammo.
The 75b with factory 20# MS, and factory length recoil spring cycles SV ammo reliably.
I realize this isn't a perfect comparo, but similar treatments were done to both, including slide rail polish and slide stop fit.
The same mags are used for testing.
I am considering returning the PCR to factory condition just to retest.
I am not seeking help to tune my PCR further. I am seeking knowledge on the effects of installing lower or higher power springs on a blowback design.
I would think the engineers, who design these kits attempt to find the best compromise, but being I am not an engineer, that is just a guess.
Merry Christmas
Rich
On a locked breach, the unlocking occurs when the pressure reduces to a pre-determined amount. Any change in recoil or MS weight may effect the opening time.
Switching gears, on a blowback, when using a lower power MS and or recoil spring, can that serve to slow or speed the slide/bolt? Can it allow the slide to begin it's rearward travel BEFORE the round built its full power?
My "experiment" uses 2 very similar pistols, A CZ PCR (75d Compact) and a CZ 75B, both have their own dedicated Kadet kit installed. A Kadet kit, converts a centerfire pistol to 22lr caliber. It is a full system.
I can't swap these kits, as the rail is a bit wider on the PCR, which takes the Kadet kit without any fitting. The PCR kit will not install on the 75b. The 75b will work on the PCR, although the barrel assembly is noticeably loose. being that kit was fit to the 75b frame.
The PCR using a 17# MS and a "cut" recoil spring ( 1.5 coils cut off) struggles to cycle SV ammo.
The 75b with factory 20# MS, and factory length recoil spring cycles SV ammo reliably.
I realize this isn't a perfect comparo, but similar treatments were done to both, including slide rail polish and slide stop fit.
The same mags are used for testing.
I am considering returning the PCR to factory condition just to retest.
I am not seeking help to tune my PCR further. I am seeking knowledge on the effects of installing lower or higher power springs on a blowback design.
I would think the engineers, who design these kits attempt to find the best compromise, but being I am not an engineer, that is just a guess.
Merry Christmas
Rich