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The lock tab may have came loose. You might hafta try disassembling the stock. You pretty much just need to remove the main screw attached to the stock. The MP5-J manual is crap. There's a bunch of tutorials on how to do so on the net so just do a search or download the A5 or A4 manual diagrams. Thats how I figured out how to take apart my MP5-J for the 1st time.
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