.223/5.56 Caliber, Spring Loaded Firing Pin, Dual Safety; Screw-on Barrel, Hairpin Safety or Screwlock "barrel lock" thumb nut so it won't loosen from vibration. Choice of two safety's which ever the user prefers, 6mm Mount Threads. This unit is very versatile. Lots of power. Used for spear fishing, Gator hunting and Shark fishing. 303 Stainless Steel. Rod & Ball Assembly Sold Separately. POWERHEAD WEIGHT: 5.7 oz.