Post by ruber on Sept 22, 2023 16:02:21 GMT -5
About 20 years ago I started really getting into CZ, mostly 75B or 40B vriants, all with firing pin blocks. Out of the box, they had very smooth double action triggers, but the single action triggers were all long, stagy, and gritty with long resets and lots of takeup. They were reliable, sturdy, and fun to shoot but were often difficult to get a consistent SA trigger for precision shooting. Wanting to improve the trigger, I looked at different ways to reduce the reset and takeup.
I wound up getting a SP01 with the intention of upgrading it. In the SP01 I wanted: reliability with a wide range of ammo & primers, all upgrades & parts to be tested and supported by a reputable company (CZC & CGW both fit the bill), high endurance in inclement conditions, all safety features 100% functional. Safety functionality and company support were a must if I were to use this for both sport and work. I also spend a lot of time in the backcountry, especially when wet or during monsoons, so reliability with dirt, scrub, and water was a must too.
Note- for folks that didn’t know, the biggest factor in the B-series reset is the lifter for the firing pin block. There is a lifter that rotates as the trigger is pulled and has an arm that pushes the firing pin block out of the way. This motion takes up about 0.2 to 0.25 inches of trigger travel, adding about 0.2" to the reset beyond what is really necessary for tge sear to release the hammer. Shadow line CZ's do not have the fpb as they are geared toward sport.
First off with the SP01 I used the CGW Short Reset System SRS-2 and Type 2 disconnector. This is a good drop in kit that greatly reduced the length to reset (0.15" or about 40%). The kit uses a CGW modified lifter shaped to minimize reset while maintaining fpb functionality. (note to self-I need some photos here too). The Type 2 disco also shortens the takeup in SA by about 0.1 inches. Together, they make the single action trigger experience much nicer.
Length to reset- I measured trigger movements of several different ‘cold war era’ service sidearms. What I call “length to ro reset” is the distance from the trigger break to where it resets a measured from the vertex of the curve of the trigger directly backwards parallel with the barrel. From factory, all my CZ B series guns were right around 0.35 inches. For comparison, my West German Sigs (p220, p225, p6, and p226) were all right around 0.1” (shortest was 0.087”), my Berettas (all pre-plastic parts) were around 0.17”, and my BDM was at 0.26” (and most people hate the BDM trigger). (I’ll get some good photos or images for this and post them eventually)
The Cajun short reset system got the trigger reset close to what the old Beretta M9’s were from the factory. Much improved, and great for a service sidearm, but still not where I was happy with it.
Here is the SP01 with the drop in SRS Kit and T2 disco compared with the factory 75B.
Enough yakking… I’m not even close to an expert on any of this, but wanted to open up a discussion. I’ll add a couple more posts about what I did to my 75B in 40 and my new 75 B SA. If anyone has experience with getting the reset shorter while still maintaining the function of the firing pin block safety, I would really be interested in it.
I wound up getting a SP01 with the intention of upgrading it. In the SP01 I wanted: reliability with a wide range of ammo & primers, all upgrades & parts to be tested and supported by a reputable company (CZC & CGW both fit the bill), high endurance in inclement conditions, all safety features 100% functional. Safety functionality and company support were a must if I were to use this for both sport and work. I also spend a lot of time in the backcountry, especially when wet or during monsoons, so reliability with dirt, scrub, and water was a must too.
Note- for folks that didn’t know, the biggest factor in the B-series reset is the lifter for the firing pin block. There is a lifter that rotates as the trigger is pulled and has an arm that pushes the firing pin block out of the way. This motion takes up about 0.2 to 0.25 inches of trigger travel, adding about 0.2" to the reset beyond what is really necessary for tge sear to release the hammer. Shadow line CZ's do not have the fpb as they are geared toward sport.
First off with the SP01 I used the CGW Short Reset System SRS-2 and Type 2 disconnector. This is a good drop in kit that greatly reduced the length to reset (0.15" or about 40%). The kit uses a CGW modified lifter shaped to minimize reset while maintaining fpb functionality. (note to self-I need some photos here too). The Type 2 disco also shortens the takeup in SA by about 0.1 inches. Together, they make the single action trigger experience much nicer.
Length to reset- I measured trigger movements of several different ‘cold war era’ service sidearms. What I call “length to ro reset” is the distance from the trigger break to where it resets a measured from the vertex of the curve of the trigger directly backwards parallel with the barrel. From factory, all my CZ B series guns were right around 0.35 inches. For comparison, my West German Sigs (p220, p225, p6, and p226) were all right around 0.1” (shortest was 0.087”), my Berettas (all pre-plastic parts) were around 0.17”, and my BDM was at 0.26” (and most people hate the BDM trigger). (I’ll get some good photos or images for this and post them eventually)
The Cajun short reset system got the trigger reset close to what the old Beretta M9’s were from the factory. Much improved, and great for a service sidearm, but still not where I was happy with it.
Here is the SP01 with the drop in SRS Kit and T2 disco compared with the factory 75B.
Enough yakking… I’m not even close to an expert on any of this, but wanted to open up a discussion. I’ll add a couple more posts about what I did to my 75B in 40 and my new 75 B SA. If anyone has experience with getting the reset shorter while still maintaining the function of the firing pin block safety, I would really be interested in it.
