Be aware that the KSG trigger group is best left as-is.
Disassembly is easy. RE-assembly is a real problem, and I'm a retired watchmaker/gunsmith.
It was a real bear to get back together without breaking the plastic.
In any case, the KSG is a shotgun, not a accurate rifle where a good trigger might be a help. Few shotguns really benefit from great rifle-like triggers.
The problem is, there's nothing to hold several parts in position during reassembly and the double hammer springs put a lot of tension on everything.
A major worry of mine is that there are round holes surrounded by plastic flanges to locate the parts and I worry that the force needed to get it together might cause the plastic around the pin holes to break.
A new grip would be very expensive.
I'm sure that Kel-Tec uses positioning and holding fixtures to assemble the unit and without those fixtures you're left with a real mess.
If you check online you'll find one or two videos on how to disassemble, but tellingly, nothing on how to reassemble.
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