S. This malfunction can be dangerous
because it can lead to a slam fire(the rifle then explodes).
The most common cause for this is Century's crap fire
control group. Some times they are not heat-treated correctly
and can become worn out. The only course of action is
to replace it with another fire control group.
If you are experiencing this with a Red Star Arms fire
control group you have the trigger set to too light
of a trigger pull or your Allen screws have changed
position while firing (because you failed to lock-tite
them) leading to a situation where your disconnector
doesn't engage.
Another possibility is your Shepard hook is installed
incorrectly and one of the axis pins has come lose causing
the fire control group to become misaligned. Look at
my fire control group installation tutoral to install
it correctly.
And finally your firing pin could be clogged with cosmoline.
To clean it follow my Bolt Disassembly tutorial and
make sure it's free of any cosmoline when you put it
back together.
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