I'm using it on a build right now.
This kit was something I picked up from a guy that started it years ago and never finished so I've had to make do with what he's done.
That said the lock is very wide, and he had it inlet just a little wrong and it's been a pita to set the triggers to function properly. The locks sear arm is
very close to the edge on the lock plate. I got it, but I won't be able to get the stock as narrow as I'd like because of the trigger arms/sear relation.
I must say the advertised "Quickness/Crispness" of the lock is there because it uses the large siler internals and would be plenty big enough for a 15/16. Here's where I'm at with an Allentown stock, a 13/16 40cal GM, and Davis DSDT triggers,