Cheap and easy way to convert triggers from single stage to 2-stage

[nervoustrigger]

Just a quick update to say I installed one of the aforementioned 5mm spring plungers and, as expected, it does a better job making the wall at the second stage more noticeable.

I did still find it preferable to use a lighter trigger spring.  It's just one I found in my spring assortment but to give you some idea, here are the numbers for the original and the replacement:

Original spring:  0.027 wire, 0.187 OD x 0.65 L
Replacement:  0.020 wire, 0.162 OD x 0.55L (cut slightly shorter to accommodate the improvised spring guide pictured above)

I suspect one could simply salvage a suitable spring from an ink pen.  They tend to be lighter but that's what I used on the original implementation and it worked fine by simply running in the adjustment grub screw to add some preload.

[USAFANG6799]

I like it! Great idea!
Many thanks for reposting!.

[YEMX]

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[WesBob]

Thanks Jason! great thread!

[Back_Roads]

It works great with the QB trigger.

I wish I could still edit the original post in the interest of the readership...hint, hint.

I would use that power to update pictures Photo Bucket Kicked 

[nervoustrigger]

Yeah I replaced the photobucket pictures a few weeks ago.  Are you seeing broken images?

[WesBob]

Thanks for doing that, pics are all showing up for me. ☺️

[nervoustrigger]

Just a quick update to let you guys know this simple mod works great on the SPA trigger (Mrodair Varmint / Plinkster / Targetmaster / etc.).  No issue with sear drag like the Crosman trigger.  Here it is on a Plinkster:



Since this is a rifle that will be used by the kids, I wanted a nice solid wall before the trigger breaks so I went with the larger M5 plunger (2 lbs).  I suspect the M4 would be about ideal for my tastes but even at the heavier pull, it makes the break so predictable that it's a very nice improvement. 

On this one, I had already done the "bushing on the lower trigger pin" mod to remove about 3/4 of the insanely long trigger pull but if you haven't done it to yours, the improvement would be even more noticeable because the spring plunger lets you blow through the long pull and gives you a stop just before it fires.

[Back_Roads]

 Is there a link or more info on the bushing mod ??

[nervoustrigger]

James, I don't know about a picture but it's easy to explain.  All you need is a 5/32" aluminum rivet.  Knock out the mandrel, keep the aluminum body and enlarge the hole with a #38 drill bit, then cut off the flange with a Dremel wheel so you're left with a simple cylindrical bushing.  Now simply slip it onto the lower pin in the trigger frame.

BTW, to hold it steady for drilling, I just pinch it by the flange in a vise.   Doesn't matter if it crushes it because you're just going to cut it off anyway.

If you also want to reduce the pull weight, take a spring from under the flint of a disposable cigarette lighter and cut it to the same length as the original (much heavier) spring.

Those two things made a big difference but the spring plunger really puts a bow on it.