I picked up a GM barrel on Ebay awhile back for my Thompson Hawkins stock and it shoots great, only problem I had is it's a fast twist for sabots, but it's taken a few deer, so I guess I'll keep it. 1st shot at 50yds after I got it was in the black. This was a NIB barrel that had been kept a few years and put up for auction, I got it cheaper than a new Thompson barrel. It came with the Tru Glow sights and they work well also.