nell:- got a T3 lite myself, and I've gone for the sako optilok, because its a 17 mm dove tail theres not a lot of choice, there's a couple U.S. makers that I came across, 1 was very expensive and the other much cheaper ones looked like they would be better on an air rifle, optilok bases and rings not cheap but they're the pukka job, try the gundirectory or e-bay, have seen them new and second hand on there.....callie