Awhile back I worked with Tim on a "Gen II" package, which incorporated some changes designed to update the gun a little, by making it slightly lighter and to give a little "crisper" firing impulse, along with a lighter trigger pull. This model is now the basis for Mac1's Benchrest package. I spent some time coming up with a model suitable for bench shooting, and in reality, there weren't a lot of changes required, though the ones made were pretty effective. The winner of our last two matches got his gun directly from Mac1 a few days prior to shooting in competition with it, and won right off the bat.
This BR version of the USFT rifle, designed for the type shooting we do, which is long range with .22 cal., has the larger airtube, stainless BR barrel, wide flat forend, and a shaft that installs under the buttstock to ride the rear bag. It uses the 'Upright Hunter" barrel block, but is bored to accept the 16mm barrel shank rather than the regular Hunter's 15mm size. .This gun offers the would-be airgun benchrest shooter an "over the counter" airgun tailored specifically for benchrest, while retaining the soimplicity and ruggedness of the original USFT rifle.
The large air tube effectively maintains a small shot-to-shot velocity spread even at higher power while maintaining the useful feature of only requiring a 1500psi fillup. The longer tube and barrel also helps put a bit more weight over the front rest.
So, while I HAD discouraged folks from buying the USFT if the intent was to use it for Bench Shooting a few years ago, I now feel its a pretty good package.