[Silent_Angel]

Humm... Good point I never thought about that, I guess I forgot to take into account that plastic gives a little while metal a lot less. Black Systema polymer piston would be fine tho correct?

I'm Trying to build a SCAR that will last me a long time with out failures, but I guess you have to open your box from time to time to check it it. Thats why I'm staying away from power upgrade, I need reliablity

Whats the difference between half and full teeth? more teeth or wider teeth or something elese?

Thanks Again