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HELP! m4a1


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#1 loopy

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Posted 01 December 2008 - 07:58 PM

Have page 12 open on the KM4 series Owners Manual. I'm stuck on step 4 (pull upper receiver up). When I do, it comes up about a centimeter and stops like it's jammed. I've opened it successfully in the past with no problem.
If anyone has any ideas, tips, or suggestions please reply.

#2 W1CKED_TR1X

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Posted 02 December 2008 - 12:14 AM

Decompress the piston, I guarantee you 100% its the piston. You know why.......because I had the same problems before O_o. Don't force it open or you'll badly scratch the piston tracks. If you have a low voltage battery like an 8.4 just fire once, to get the piston into resting position. Then your upper receiver should open no problem.

#3 loopy

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Posted 02 December 2008 - 04:23 PM

success it worked :)

THANKS!

#4 brooklyn468

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Posted 02 December 2008 - 06:32 PM

Always take a shot or 2 on semi after you are done with a day of airsofting.




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