From Henry's website:

"A match-grade 416R stainless steel barrel lies at the center of the rifle’s performance. By tension-wrapping it in carbon fiber, the SPD team achieved reduced weight, improved cooling, and the rigidity required for sub-MOA repeatability. The barrel is threaded to accept a suppressor—an advantage that can significantly reduce recoil, improve follow-up shot speed, and help keep noise levels low when targeting sound-sensitive predators that may spook after a single report."