The Magnum Lite(R) features an 11 degree crown and a patented gas system and block under the barrel that taps a small amount of gas through a hole in the barrel.
Magnum Research MLR 17/22, Semi-automatic, 22WMR, 18″ Stainless Barrel, Black Finish, Hogue Overmolded Stock, 9Rd MLRS22WMH