I had one of the 20" SBS Tacticals - IIRC, they use Browning A-Bolt bases, but some of them didn't fit right...
Overall, I was unimpressed with the rifle. The stock was an especially flimsy POS - slight pressure is all that it would take for the fore end to come in contact with the barrel. After 5-6 shots the stock would heat up, warp and once again start touching the barrel. I didn't have a borescope, but the bore seemed very rough based on the amount of copper fouling it picked up and how difficult it was to remove it. I couldn't get it to shoot better than an inch - that is, during the first 3-4 shots. Once the stock warped accurracy went to hell. Granted, I really didn't get a chance to reload for it, but it is somewhat hard to work up a load when you can only shoot a couple of shots an hour.
If it wasn't for the stock, it would probably make a half decent rifle. Unfortunately, other than paying $600+ for a McMillan stock (GSI contracted with McMillan to make run of stocks for one of their high-end versions), there wasn't any other options. I believe CDNN was eventually selling the McMillan stocks for around $300 (bought out all of GSI's inventory when they were dropped as the importer), but I had already sold it. Mine was the "standard" barrel and they were inletted for the HB anyway, so would have probably looked a bit goofy.
Here's a few pictures of the stock after 4-5 shots. The quality sucks, but you should be able to see the problem. I never heard of anyone else with the warping problem, although pretty much every agreed the stock was like a wet noodle. Simply laying it on the rest near the foreend (or using a bipod) was enough pressure for the stock to contact the barrel.
Rocko