Hello there. I'm very new to gas powered smg. I own a new mp9, and everything works just fine. I got my hands on a used one, and i have the following problem: i insert a mag, pull the charging handle, and when i release it the mp9 will start firing by itself, sometimes until the mag is empty. I think there might be a piece missing under the hammer but i don't know how to get there. ( sorry for my bad english)
thanks for any help i can get.
mp9 fires when releasing the charging handle
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