"Both guns suffer from barrel droop and require the scope to be shimmed. "That's nice to know.Here's mine. It's a TF-99M in .22 caliber. Was shooting it @ 50 yards this past year (first I'd ever tried that, mind you), the iron sights ran out of adjustment, put a Williams FP-AG on it, it's setting at the bottom hash mark last I tried. Grouped pretty well at 20-25 yards. Not even going to a scope was getting me on paper at 50 with it. But the Gamo Shadow 1000, yup, with a little holdover. LOL
Both guns suffer from barrel droop and require the scope to be shimmed. Also they both have issues with getting the anti-bear trap to work regularly.
Get the full tune from Mike and you won't believe it. My XS46U is so smooth and the trigger is awesome. Mike is a master tuner of these guns, and worth ever penny of the extra cost. Stay with the high performance spring that comes with the full tune.
The extra cost of the MM full tune is worth every penny, I will not order any gun from FD without it. I shoot 3/8" groups at 30 yards with H&N FTT .22 cal pellets.