Thompson Center Hawken Barrel Assembly Percussion Muzzleloader. 50 cal admin - September 26th, 2025 Comments Off This is a used but in great condition Thompson center Hawken percussion Stock assembly. The barrel channel is a 15/16 and could be used with a flintlock as well with a little modification. There is 2 brass sling swivels added. Categories: thompson Key Tags: assembly, barrel, center, hawken, muzzleloader, percussion, thompson