Does a longer barrel improve performance? 9mm carbine 124gr Federal HST gel test
This guide details a ballistic gel test of Federal 124gr +P HST ammunition fired from a 16-inch barrel CMMG 9mm carbine. The test, conducted by Andrew, an expert, evaluates bullet performance in both bare and clothed gel, measuring velocity, penetration, expansion, and retained weight according to IWBA standards. The results highlight how barrel length and clothing layers significantly impact defensive ammunition effectiveness.













