I have a CZ 452 Trainer that the scope has always needed to be a little closer to my eye. The adjustability just wasn't there. Last week I saw a fellow shooter talking about ways of solving this problem. He mentioned BKL Technologies in Ft. Worth.. I contacted them last Friday. The lady that answered the phone gave me the impression that it must be Tuesday, not Friday. In about 5 minutes I ordered a model 254HMB. I received it this morning. Very solid, and well made. The cost was around $50.00. My scope has a 44mm ocular bell. Plenty of adjustment, and ejection room. Couldn't believe she was so helpful, particularly on Friday. Made my day. L.B.