The Original CZ Forum
CZ LONG ARMS => CZ Scorpion EVO => Topic started by: liv4spd on March 25, 2025, 05:21:11 AM
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It seems that people really like the HB Industries Reduced Weight Trigger Spring Kit. However, I think the kit missed the point.
Upon inspecting the stock trigger, I believe the primary issue lies with the overly stiff spring on the hammer. It only moves a short distance before disengaging from the hammer, which is a flawed design. As a result, the spring's stiffness is relied upon to strike the firing pin effectively. A better design would feature a less stiff spring that stays engaged with the hammer throughout its travel, much like the design of Timney triggers. I particularly appreciate Timney triggers because they also make it significantly easier to pull the charging handle.
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Before/After with my own Scorpion and the HBi springs:
Unaltered trigger pull weight
Wt in Kg Wt in Lbs
1 5.13 11.31
2 4.69 10.34
3 4.86 10.71
4 4.73 10.42
5 5.14 11.33
6 5.04 11.11
7 5.22 11.51
8 4.86 10.71
9 5.23 11.53
10 4.91 10.82
average 4.981 10.979
HBI Spring Kit
1 2.79 6.15
2 2.54 5.6
3 2.91 6.42
4 2.54 5.6
5 2.37 5.22
6 2.62 5.78
7 2.54 5.6
8 2.48 5.47
9 2.73 6.02
10 2.86 6.31
Average 2.638 5.817
So, it dropped the pull weight in a bit less than half. Not too shabby for the cost and effort.
The other issue is takeup and overtravel. I've shimmed them and welded/filed to reduce those, with varying degrees of success. I'd like to set screw one trigger housing and see how that goes. Projects...
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I think the HBI kit is the bomb. For me it greatly reduced the weight 'feel' and maintains a reliable hammer.
To me also reducing the hammer spring in this gun is NOT a good thing. The bolt traveling rearward cocks the hammer. A heavier hammer spring absorbs recoil of the heavy bolt and softens felt recoil. Also, slowing the bolt enhances safety in semi auto.