Quote from a review of the AA Trigger set
"I installed this on an otherwise I modified Tokyo Marui vsr10 gspec with the action army spring guide and m150 spring. There were three immediate and unacceptable issues.
1) the box is too tight and does not allow the seat to return properly after the first shot. I had to shim the inside of the box with .1mm shims for it to function.
2) the spring guide stopper was too wide to properly fit through the cylinder channel to retain the spring guide, this required hand filin and fitting
3) the sear was too wide to consistently fit through the cylinder channel to retain the piston, also requiring fling and fitting.
For $150 I expect something that fits and functions without excessive filing grinding and fitting. The materials seem quality at first, but are also already showing signs of excessive wear and I've only been able to use it on the field once due to this trigger causing near constant failure of my rifle.
I consider this part to have been a very poor choice for my build, and will not repeat that mistake."