[fuzzywolly]

I prefer the AA piston over the laylax one. Quite frankly, the laylax one was complete shit and gave very poor seal over the last few months I used it. Granted, it was rather old, but the design and use of the o-ring on the AA piston is something I like.

Also got my hands on the AA trigger today, and is very well built and is something that I was quite impressed with.