Got this one on Amazon. Actually got two, one for mine and one for a friend. Both used on a SR22. Bought them in 2019, set them up on Galloway bases and have held positions since. We both have Fastfire 3’s on ours. Ran for $14.95 back in 2019.
UM TACTICAL Delrin Shim 1.0 Degree for Vortex Venom...