Airsoft Canada - View Single Post - Tanio Koba / KJW M4 GBBR Basic Information and FAQ

D2D · April 21st, 2012, 22:22

Hi guys - so my KJW M4's been giving me problems since day one. Instead of typing up a wall of text, I thought I'd just make a video.

Defective KJW M4 - YouTube

If I shim the upper receiver so as to lessen the horizontal play of the bolt carrier, the dust cover and bolt catch start to function as they should. The failure to go into battery problem is still there, presumably because I haven't eliminated the vertical play of the bolt carrier.

So hopefully if I'm right, I just need to replace the bolt carrier. I might be wrong, though - I don't have a properly functioning KJW M4 to compare with. Can you guys check how much play there is between your guide rod and your v2 bolt carrier?

April 21st, 2012, 22:22	#731
D2D Trader rating Join Date: Oct 2011 Location: Toronto	Hi guys - so my KJW M4's been giving me problems since day one. Instead of typing up a wall of text, I thought I'd just make a video. Defective KJW M4 - YouTube If I shim the upper receiver so as to lessen the horizontal play of the bolt carrier, the dust cover and bolt catch start to function as they should. The failure to go into battery problem is still there, presumably because I haven't eliminated the vertical play of the bolt carrier. So hopefully if I'm right, I just need to replace the bolt carrier. I might be wrong, though - I don't have a properly functioning KJW M4 to compare with. Can you guys check how much play there is between your guide rod and your v2 bolt carrier? Last edited by D2D; April 23rd, 2012 at 23:58..