Hi everyone, im new so im trying to understand everything before i purchase my first speargun. I have a few that catch my eye but was worried about getting replacement shafts and parts for some. My question is, are the shafts interchangeable between pneumatic spearguns? From what i see they look very similar, the guns i was looking are are the salvinlmar predathor vuoto, the mares cyrano 1.3 hf or 1.1 hf, the cressi sl, and the seac sub c/r