I have bought two 1/2-20 adapters from Trajectron, one for Weihrauch HW44 and one for Steyr LP50. I initially bought the adapter for the HW44 to get rid of the cumbersome solution for the Weihrauch silencer, but also bought an adapter for the LP50 when I first needed something from Trajectron. Both adapters look good, are well made and fit perfectly. Thumbs up! 
The only thing I can put my finger on, is that the LP50 adapter should have come with an M3x5 set screw incuded, the original M3x3 set screw disappears uncomfortably far down into the threads of the barrel shroud when the adapter is fixed. An M3x5 set screw would have been perfect to fasten the adapter with.
The only thing I can put my finger on, is that the LP50 adapter should have come with an M3x5 set screw incuded, the original M3x3 set screw disappears uncomfortably far down into the threads of the barrel shroud when the adapter is fixed. An M3x5 set screw would have been perfect to fasten the adapter with.