take your upper out of the rifle, press the nozzel in and if it springs back then your tappet plate is good... if you feel comfortable doing so; take the upper apart and take a look at the piston and make sure all the teeth are there... you can also take a better look at the tappet plate and spring if they're all good, slap it back together... It's a problem with your lower gear box.
it could be gears (broken teeth)... shimming... or a motor issue
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