I like the HUXWRX (formerly known as OSS), design.
that mask on a 22/45 tactical is awesome, once you swap out the factory fire controls with volquartson
The best thing I ever did was swap out my factory Ruger parts for Volquartsen in my MK IV 22/45 Tactical.
All Ruger had to do to make a decent factory trigger pull with their parts was stone the engagement surface of the sear. As it was, when I ran it across a stone it looked like a topo map.