‘FSSG for the KPOS’
My one and only biggest frustration about the KPOS right now, is making an FSSG work on it. First problem, is that you will need a special FSSG (Fire-Selector Switch for Glock) for it, instead of the usually cheaper, flat, sliding or rotary FSSGs that are more readily available. This is because you need a backplate that will act both as an FSSG, and also as anchor for the removable cocking lever. This means you will have to get the rarer, and more expensive variant of the FSSG.
As for installing the FSSG on the Glock: They replace the backplate, and instead of my usual routine of removing the slide from the frame and replacing the backplate, you needed to replace it while the slide is still attached to frame. This is because the FSSG is bulky, and if you install it on your slide and slide it to your frame, it will snag with some of the frame’s protrusions.
The way to install it is to lock back the slide using the slide release, then replace the backplate with the FSSG. This would also mean that you will NOT be able to disassemble the slide from the frame easily, you will have to remove that FSSG first, before you can remove the slide from the frame.
‘FSSG Fitting Problem’
I was able to buy an FSSG from Bro Spitfire, and it needed gunsmith fitting. There is a sword-like protrusion on the FSSG that goes forward and backwards, and it controls whether the gun goes full-auto or not. The depth or distance of this protrusion seems to vary per model, and is built oversized so the gunsmith can slowly file away by trial and error the length of that protrusion. So what the gunsmith did was file it down a little, assemble, then test by firing a couple of rounds off.
The second problem was that the Gunsmith didn’t turn out to be very familiar with the product, and made a crucial mistake: He got confused on when the FSSG was supposed to go full, or semi-auto. So he put the gun on extended or full auto settings, and then filed it down to semi-auto. The result: The FSSG won’t go full auto anymore.
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