muzzle-loader

/M AH1 Z AH0 L L OW1 D ER0/
noun
  1. 1

    A variety of firearm in which the weapon is loaded from the end that discharges the projectile (the muzzle).

Source: https://en.wiktionary.org/wiki/muzzle-loader, https://en.wiktionary.org/wiki/muzzleloader