my HK 416
now that you mention the motor it did seam to give off some heat and i did have some problems fitting the motor in to the new SPR grip every time i mounted the motor it started to grind, I finally got it in and cycling without the grinding noise i was pushing the motor to for into the grip. I'm guessing but i bet its the fit of the motor....it does not make any grinding noises at all maybe I will change the grip to the original and see what happens.
As for the meckbox it is stock except I did change the piston but i had fielded the new piston with the battery and old handle and it did not have a problem.
My gun VFC HK416 DX
meckbox stock internals except for the piston everything in-side is metal
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