Quote:
Originally Posted by Styrak
My suspicion: Both of the motor wires should run along the back of the grip. If you have them split, you're gonna have a bad time.
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Untrue. It really depends in the make and model of the grip.
But it is not uncommon for the lower section of the receiver to be too low, causing the mechbox to tweak backwards and the pistol grip is installed.
Try the pistol grip on the mechbox without receiver first as someone said. It will sort out if the problem is from the receiver or not.
Then if it works perfectly outside, install the cross pin first, then the stock second and pistol grip last. Do not tighten it fully, and check if there is uneven spacing between the grip and the receiver. If so, your receiver is bad and you will have to shim and or file some of it.