Bellm TCs now has in stock a quality Feeler gauge set for measuring the critical barrel to frame gap of any Thompson Center single shot.
This quality feeler gauge set is a must have for every T/C owner. You can easily use this feeler gauge set to determine the clearance between the breech and barrel, aka barrel to frame gap.
Once your barrel to frame gap is known our headspace shims can be used to make a correction to headspace. The results are amazing! Better case life, increased accuracy, eliminates misfires, adjusts for manufactures intolerance for headspace, etc.