The thing is pretty decent especially when you consider it is $100 less than the Laylax Z-Trig. However that does come with its drawbacks...
Overall, a great value for $121, which, with a 20.5% discount, equates to sub $100 for a nice trigger mech.
-Build quality is of course lesser than the Laylax, but the functionality remains almost identical
-Nylon guide rings are smooth once lubricated
-Steel seems to be properly machined and doesn't show any wear after 1000 rds on a M170 spring.
-Internal spring broke, easy replacement if you know where to buy extension springs.
-Disassembly and reassembly is extremely annoying, especially if you don't know where something goes.
-Stock o-ring is not a good fit for the cylinder, as it is too small. Size is #13 from Home Depot or McMaster-Carr.
-Spring guide stopper and piston sear are much too thick for the receiver, a generous amount of sanding and cutting was required to make the bolt pull smooth.
-The rubber pad is scantily glued on, so it fell off after a few hundred rounds. It's not bad, but I replaced it with sorbothane just for good measure.