What's the best snap to connect the shooting line to the muzzle bungee? IMO it's the pigtail or corkscrew snap and swivel combination such as this one from Speardiver Pigtail Snap & Swivel 450 lb.
In response to this I often hear guys say that they don't like to use this kind of snap because it's too difficult to attach and remove the shooting line. This is not true, watch the video and tell me if you think it looks difficult.
Pigstail Snap & Swivel for Speargun Muzzle Bungee - YouTube
In my experience between the two commonly used snaps the pigstail and the coast lock, the pigstail has more holding power and is much easier/quicker to attach the shooting line to. See this pic of a supposed 400lb coast lock snap that a 20lb barracuda opened and straightened out after the speargun got stuck in structure. I've never seen or heard of this happening with a pigtail snap. I don't think it's possible, another part will have to fail first.
Why do some find it difficult to use the pigtail snap? Two reasons.
1. Haven't seen the right way to put the shooting line through. Once you get this rotating motion right it's very easy to do even with gloves. It then makes using the coast lock snap a real PITA by comparison.
2. Pigtail snaps from different manufacturers may vary in shape. In some the coil/pigtail may be pressing too hard against the stem of the snap, making it difficult for the shooting line to pass. This is easily remedied by pinching the main bend of the snap with pliers to create a little more separation between the coil and the stem. Pigtail snaps from SpearDIVER come ready to use and no adjustment is necessary.