P90 Hop up stabilizer

Here's a stabilizer for the SSR90. I noticed the hop up could wiggle a bit, which made the shots go side to side, so I designed this fix for that.

Tolerances here are crucial, so play around the horizontal expansion setting to achieve a really tight fit between the block and the upper, and the block and the little cam on the hop up chamber.

It's better to print it too thick and give it a slight sanding afterwards, than too narrow and have it loose.