Quote:
Originally Posted by ujiro
Just a note; I had some issues installing the MASK piston head into a presumably SystemA (yellow) piston body. It got caught slightly on the metal tooth insert of the piston. Just required some force to get into place.
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Systema pistons are not yellow. I've only seen yellow pistons made by Classic Army, but I'm sure there could be more manufacturers.
Systema is not one of them.