![]() ![]() These are the two parts that we will be working on to create a good contact point to engage part 92 on Semi. Of all the four Glocks, both part 261 and 260 were worn thin. If the two can’t work together to make contact with the little nub on part 92 while semi auto is selected then the gun will shoot full auto. Part 261 and 260 are the culprits for the problem. ![]() Thus, lifting the whole blowback assembly higher than it should primarily sit therefore preventing part 261 from interacting with part 92. All of the four Glocks that I’ve fixed had the aftermarket slides that sat a bit higher than the stock slide. The secondary, give or take, root cause is that most after market metal slides are not milled properly along the bottom edges. Couple that with improper use of lubricants, and you’ve a gun that can only shoot full auto when it should have a secondary mode. The problem then carries over to prolonged usage that wears the parts out very easily. The problem stems from the poor design of the Glock itself and the materials used. While there are many causes for the KSC Glock 18c firing full auto semi mode, there are only really two cascading causes. That’s how the fire selector mechanism in a nutshell. Thus, if you turn the external fire selector, part 260 will either raise or lower part 261 (depending on how you want to shoot the gun). Part 260 is the direct link between the external fire selector (part 255) and part 261. ![]() Now, in order for the gun to raise or lower part 261, a small “wheel” or cog is installed beneath part 261 to pivot around selecting semi or full auto. If it 261 is raised, the gun should fire in semi auto mode. If the part 261 is lowered, it can’t make contact with part 92. This little bar is part 261.ĭepending on the position part 261, the gun can either shoot full auto or semi auto. The primary function of the trigger bar (part 92) in regards to the fire modes is for that little nub on the trigger bar to make contact or not with a small metal bar on the blowback assembly depending of course on how you want the Glock 18c to shoot. See the nub on top of the trigger bar (part 92)? That part needs to interact with the blowback assembly to engage the full auto or semi auto functions of the gun. Get out your parts diagram because you need to refer to the specified parts to understand how it all comes together. In order to diagnose the problem, first we must understand how the internal switch selector works and how it should interact with the frame assembly and its internals. There is a small spring, part 262, that can ‘spring‘ out that you can never find ever again…ever. I also don’t recommend doing this if you don’t feel comfortable taking the slide apart. Take it to them first and have them fix your gun for you. Now, I don’t recommend you doing this if you have a gun technician readily available. So for the sake of people having this same problem and for the new guys on the forum that might be running into the same problems, here is a quick do it yourself fix. I realize that this is probably of older knowledge now as the gun is super old. Though all of them have their different problems, a common one among all of them was that their gun CAN'T SHOOT SEMI WHILE SEMI-ENGAGED. And I'm getting emails from friends asking me to fix theirs. So I just fixed 4 KSC Glock 18c's in the past two days. ![]()
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