The Rob Allen "L" Shaped Muzzle Eye is a stainless steel accessory that is fixed to the muzzle of any Rob Allen Speargun to create a line guide for a reel. It is situated under the muzzle and is where you thread your dyneema line when rigging up your gun with a reel. This means that when you shoot a fish, the line will flow straight through the "L" Shaped muzzle eye which aides in greater control of your fish.