So I’ve been looking into the slide lock
Ruled out barrel tilt in our units as the outer moves rather freely and the proposed test routine doesn’t show it to be the issue
So I pulled down the blow back assembly
Nothing to see there perse. The plastic assy leaves a bit to be desired in terms of quality finish but nothing obvious.
So…onward…and more looking.
I noted the slide stops basically where you see the wear point at the back of the GBB unit on the right as you look at the image.
So onward to the disassembly of the hammer unit…
At the end of it all, I’m not sure if I’ve fixed it but it wasn’t much of a prevalent issue for me to begin with
That lump on the GBB unit is responsible for running over the hamer wheel and receiving the sear catch just enough that the hammer comes up completing the return of the slide…
At least as far as I understand the mechanism
Now…things I did do
- Lubricate the hammer wheel and shaft
- Clean and lube the piston cup and cylinder which is D shaped
- Lubricated the gbb piston return spring
Things I didn’t do but should have maybe done
DON’T: Trimmed the hammer spring so it doesn’t extend up behind the hammer wheel. The spring is a source of rotation friction - UPGRADE the hammer wheel instead. its important to not you can put the hammer spring in upside down and back to front
POINTLESS: Bend the hammer spring to loosen it slightly - KUBLAI are just a little different enough in this housing to make any trigger spring bending pointless since it pinches in the corner of the bend and doesn’t leverage on the arm of the bend
If our problem is this lump and wheel, then reducing friction and spring tension should resolve it. I’m not keen to flatten the hump as it may completely balls up the hammer release from the sear.
And that’s some fiddly shit
Things I will replace
- Slide return spring. It might actually resolve the slide lock all by itself - not doing this any more either. a heavier spring will slow cycle rate and increase effort to move the slide wasting gas.
- If I can get a nice metal GBB cylinder and plunger… definitely
- Nozzle with an o’ring if the exist
Note to self…do not disassemble hammer assembly without legitimate need…and two fkn thumbs