I was trying to open the gun with the hex key. It looked like I had to take the side off, but what you said about the butt plate sounds familiar from stuff I've read about the P90. I had assumed the removal was after you split the gun in half - sometimes things don't click when you're reading while tired.
Thanks for the information. The first P90 does not fire at all in semi, so it is probably the first suggestion you had, about the burned/worn first trigger contacts.
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