Never used, with the following improvements...
1) First staged pull, smoothed by fine stoning.
2) Second stage let off weight lightend, by reduced spring pressure.
3) Second stage creep reduced to .010 by stoning.
If anyone is unfamilier with Armalite triggers, they move the trigger possition further forward then any other maker. It is even further forward than the Geisselle trigger. It is a more comfortable trigger possition. I will guarantee this trigger for two weeks after you receive it. If you don't like it, you can return it for a $140 refund. You would have to pay for the shipping.