Salvimar Roller Muzzle

The Salvimar roller muzzle is available in two diameters to fit a wide variety of speargun models. The 26 mm muzzle is the standard size for Salvimar or similar sized barrels. The 25 mm muzzle fits Rob Allen and other similar sized barrels.

Benefits of rollers are:

Increased power ~30%
Increased speed of the shaft
Increased Accuracy
Less recoil

Downsides:

They are much harder to load