Some comments on Crosman Triggers

[DanD]

... A lighter (but not too light) trigger blade spring will reduce trigger force. It may also allow me to feel if there really is 2 points of contact (2 stages) with the sear lever....

I think you'll find that's the case. Unlike the B19 trigger, the CBT has a true two stage geometry hidden under that heavy spring.
Good luck with yours!

[PEngineer]

My Crosman Summit Ranger arrived July 15 from Midway, great deal.

The trigger adjustment screw was all the way in making it a single stage action using only the second stage contact point, the screw.

Adjusting the screw out 3 turns resulted in a single stage action using only the first stage contact point, the ridge in the channel that the sear rides in.

Adjusted the screw in 1 turn to get the two stage trigger action.  Trigger pull measured 6 lb 10 ounces.

This morning I installed the SLT Trigger Kit from eBay but did not polish or add any lube.  Trigger pull measured 3 lb 11 ounces with a clearly defined second stage.

I have fired a total of 5 pellets thru this rifle.  Some break-in plus polish and lube of the trigger assembly should make it even lighter and smoother.

My other rifles with the Kit installed, polished and moly lubed measure 1 lb 14 ounces to 2 lb 2 ounces.

The CBT has the potential to be a very nice two stage trigger.

[mikeyb]

I had a little time this morning to look a bit closer at the Crosman CBT in my Summit Ranger.

Also received a trigger scale last week so I can now quantify what trigger force feels good (or not).

With my longer screw mod to shorten the long trigger travel and NO spring change, the trigger scale averaged just under 6 lbs. I think this is still too heavy.

I measured the factory coil spring wire at 0.035" thick. Spring has 0.25" outer diameter and 0.525" free length.
I have some 0.026" "full hard temper steel spring wire". Wound a spring that measures 0.25" outer diameter and 0.550" long from the 0.026" wire. It was obviously lower force, but I was uncertain exactly how it would work (or not) in the CBT.

Reassembled the trigger with the custom spring and installed action into the stock. Rifle cocked just fine and trigger seemed to be stable. Trigger scale now averages 2.5 lbs. MUCH BETTER!

DanD was correct that this really IS a 2-stage trigger. I can now feel the 2 contact points and watch how they interact with the sear lever. I reinstalled the factory adjustment screw since my longer screw mod is no longer needed and could be dangerous if over adjusted. I now have the trigger adjustment screw set for a moderate first stage followed by a short crisp second stage.

Sub-dime 10 shot groups (30' w/open sights) are now EASIER because trigger force is lighter.

There is one WARNING I should mention for anyone attempting this type of modification. I suspect the factory spring is STIFF so that when the trigger is partially set and then released, the sear levers will return to FULL ENGAGEMENT. I can tell that my lighter spring does NOT do this reliably every time. If I partially set the trigger and release it, the sears move and may STAY at a reduced engagement until the trigger is pulled through full release. This is usable, but I'd prefer a fully resetting sear engagement.

I plan to make another spring using 0.029" spring wire. My goal is to have the sears fully reset after a partial trigger pull and release. I'm hoping the 0.029" spring will result in a trigger force around 3.5 pounds max. Will update with new results when available.

[mobilehomer]

There is one WARNING I should mention for anyone attempting this type of modification. I suspect the factory spring is STIFF so that when the trigger is partially set and then released, the sear levers will return to FULL ENGAGEMENT. I can tell that my lighter spring does NOT do this reliably every time. If I partially set the trigger and release it, the sears move and may STAY at a reduced engagement until the trigger is pulled through full release. This is usable, but I'd prefer a fully resetting sear engagement.

This is BALK FIRING and not a function of the spring, Read this article -
https://www.gatewaytoairguns.org/GTA/index.php?topic=18419.0