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nic_s · April 21st, 2006, 18:50

I got my MP7 when they first came out, and I bought it new. Since day one though, it's had some troubles. When firing on full-auto, the BBs would usually just drop out of the barrel and fly about ten feet. Semi-auto was better but it would often have the same problem. Not all the time though, which is strange. Now, when it does this, the gun sounds like it's dry firing. This makes me think that the nozzle is retracted when the piston moves forward to push the air out of the cylinder.

So, I took the gun apart, and upon inspection of the gearbox I have found that the gear timing apears to be off from the factory, since the nozzle was about half way back at 'zero'.

After opening the mechbox, I also found that the damping foam on the cylinder head was partially torn, and there was a chunk that was about to break free. I removed all the damping foam, since the asymetric nature of the torn foam would probably affect accuracy. That's a minor detail though. The main issue here is ger timing.

So: Has anyone here had similar issues? How did you fix it? Any thoughts or theories?

April 21st, 2006, 18:50	#1
nic_s Trader rating Join Date: Oct 2004 Location: BC	MP7 Problem, Gear Timing I got my MP7 when they first came out, and I bought it new. Since day one though, it's had some troubles. When firing on full-auto, the BBs would usually just drop out of the barrel and fly about ten feet. Semi-auto was better but it would often have the same problem. Not all the time though, which is strange. Now, when it does this, the gun sounds like it's dry firing. This makes me think that the nozzle is retracted when the piston moves forward to push the air out of the cylinder. So, I took the gun apart, and upon inspection of the gearbox I have found that the gear timing apears to be off from the factory, since the nozzle was about half way back at 'zero'. After opening the mechbox, I also found that the damping foam on the cylinder head was partially torn, and there was a chunk that was about to break free. I removed all the damping foam, since the asymetric nature of the torn foam would probably affect accuracy. That's a minor detail though. The main issue here is ger timing. So: Has anyone here had similar issues? How did you fix it? Any thoughts or theories? __________________ ...and she's terribly partial to the periwinkle blue.