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The rear assembly of your gun is toast. that piece that you found is broken off when you release the hammer with the slide off. Without the slide in place, there is nothing stopping the hammer from striking forward except for that metal piece you found. MadMax once made a post warning KSC Glock users to never release the trigger/hammer with the slide off if there is nothing to stop the hammer from striking the frame (such as the slide or your finger.)
I'd like to help you with your problem, but such GBB gremlins are very difficult to e-diagnose. It must be handled and inspected in person. Are you injecting silicone oil into your magazines?
Regarding your slide blowing off the rail, this is very very very common for plastic slide KSC Glocks running off propane. They're just not built to take that kind of power all the time.
The following are practices that should be maintained with ALL GBBs for the greatest amount of longevity:
The steel mag catch issue: almost ALL GBBs, if you care about the durability and finish of the mag and mag catch itself, ALWAYS press the mag catch in and hold it in before you insert the magazine and only release it once the magazine is fully inserted.
This prevents the paint being scratched off the mag.
If the catch is plastic, doing it this way will also prevent the edge of the catch from wearing down quicker. If your plastic mag catch gets worn down, your mag will sit too low and you will have power losses as well as feeding issues due to the poor seal.
Also, when releasing the magazine, push up on the base of the magazine before pressing the mag catch, and THEN let the magazine fall out, while continuing to press the mag catch.
Another one that many people are not aware of: when your slide locks back and you insert a new magazine, AVOID using the slide catch release to drop the slide back into battery. Using it will add premature wear to the corner on the slide that interfaces with the catch. If possible, pull back on the slide after inserting the new magazine to return it to battery.
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