I've never been comfortable about shimming scopes... apart from the thing of adding another element to go wrong, it still means the scope is stressed and i've seen scopes become either bent, dented or start to grind with a lot of shim. So, for me it has to be adjustable. For a couple of years at least i've been using B-squares, which are adjustable for elevation and windage. The only catch is that if your not careful you can introduce crossover... although you can cure it as well. The Sportsmatch aren't adjustable for windage... but I slung a set I bought on the new walther rig tonight. I'd set leveled the scope at home. Down at the club, I checked for crossover between 8 and 25 indoors and couldn't detect any. Then optically centred the scope. Then set up the elevation so 55 yds would be bang centre. The elevation correction works with a single grub screw, so you can nip the scope up to hold a pretty good zero, then just turn the screw till shes pointing at your aim point, then tighten up. This makes life pretty easy and fast to set up, especially compared to the b-squares which require un-mounting to adjust the elevation. I reckon the whole thing took me about 2 mins longer than zeroing a normal set of mounts... and it's definately faster than shimming ... and you get an unstressed scope in optical centre. The all clamp up tight so I've got no worries about them moving. So in the future, i'll be using these, unless i've got crossover... in which case it will be the b-squares. They clear a 56mm scope, but FT'ers might want a set of riser blocks underneath for a more head up position. Blackpool are doing them here http://www.airgunbuyer.com/Showproducts.asp?cat=Telescopic Mounts&SubCat=Bisley Telescopic Mounts for about £15 more than a normal set, or about the same as reach forward mounts. Only grumble is I think you need 3-4 allen keys... one for the dovetails, one for the scope mounts, one for the grub and I think i needed another for the locking bolts... but that's a minor grumble.