Choosing your first speargun — or upgrading to your next one — is one of the most important decisions you'll make as a spearfisher. Get this wrong and you're either losing fish or fighting your own gear. Get it right and the gun disappears — it's just you and whatever is moving along that ledge 40 feet down.
This guide is written for Hawaii waters specifically. The conditions here, the fish species, the reef structure — it all shapes what gun you actually need.
Two Main Types of Spearguns
Band-Powered (Rubber Band) Spearguns
The most popular type worldwide, and the right choice for most Hawaii diving. Band-powered spearguns use rubber power bands stretched across the muzzle to propel the shaft. Load one band for shallow reef work, two bands when you're going deep for kumu and mu, or hunting ulua on the Makaha ledges where you need maximum range and stopping power.
Best for: The vast majority of Hawaii spearfishing — reef, ledge, cave, and mixed-depth diving
Pros: Reliable, easy to service, adjustable power
Cons: Bands degrade in Hawaii's UV and saltwater — inspect and replace regularly
Pneumatic Spearguns
Compressed air powers the shot. Extremely powerful for their size — a 75cm pneumatic can hit harder than a 110cm band gun. Some divers prefer them for bluewater hunting or for fishing in tight spots where a long gun is a liability.
Best for: Experienced divers, specific big-fish scenarios
Pros: Compact power, no bands
Cons: Requires a special pump or adapter, more maintenance, less beginner-friendly
Pole Spears
Don't sleep on the pole spear. Many of Hawaii's most experienced divers carry one as a secondary weapon — especially for menpachi in caves where even a 75cm gun is too long and clumsy. Some west side locals use pole spears exclusively for cave work at Mākaha Caverns. Simple, silent, and deadly effective for the right target.
Speargun Length: Match the Gun to the Spot and the Fish
This is where most people go wrong. They buy a gun based on a YouTube video from someone diving in the Mediterranean, then show up at Portlock wondering why they can't get close to an ulua. Length is everything. Here's how to match it to where you're actually diving in Hawaii:
Under 75cm — Cave and Tight Reef Work
If you're hunting menpachi (soldierfish) in the caves at Mākaha Caverns, working tight ledges on the west side, or stalking aweoweo (bigeye) in the cracks at Pūpūkea — this is your gun. Short, quiet, maneuverable. You're not taking long shots. You're getting within a foot or two and squeezing the trigger. A pole spear often outperforms a gun this short in pure cave hunting scenarios.
75–90cm — Shallow Reef
Perfect for Oahu's shallower reef scenarios: hunting uhu (parrotfish) at Nānākuli or along the Sandy Beach corridor, taking papio (juvenile ulua) in open reef, or working the north shore's shallower sections in summer. Visibility in these spots is often 20–40 feet — you don't need long-range reach. One band, easy to load, fast to maneuver.
90–110cm — The Hawaii All-Around Workhorse
This range handles 80% of Hawaii spearfishing situations. You're covering reef, moderate depth (20–60 feet), and mixed targets. The Hammerhead Evolution2 in the 100cm range is built for exactly this: kumu hunting at Makapu'u along the sand-reef edge, shooting mu as they school around structure off Laniākea, taking papio at Alan Davis Beach, or running two bands when the fish are hanging at 50+ feet and you need the extra reach.
If you can only own one gun for Oahu diving, it lives in this range. Start here.
110–130cm — Ledge Hunting and Big Fish
When you're going after ulua at Makaha — sitting still on the bottom at 50–60 feet, waiting for a big GT to cruise the ledge — you need reach and power that a 90cm gun can't give you. A 110–130cm gun with two heavy bands and an 8mm shaft is what this scenario demands. The ulua here are big, fast, and they know the ledges better than you do. You may get one shot. Make it count.
This length also works for kumu and mu at Portlock and Makapu'u when you're hunting deeper structure and need to close the gap from distance without spooking fish that have been pressured before.
130cm+ — Bluewater
Open ocean, pelagic targets — ono (wahoo), mahimahi, kahala. This is specialized hunting and not what most Oahu shore divers are doing. If you're at this level, you already know more than this guide can tell you.
Shaft Size: Don't Undergun the Fish
Standard shafts run 6–8mm in diameter. For most Hawaii reef hunting — uhu, kumu, mu, menpachi — 7mm is the sweet spot. Strong enough to hold the fish, light enough to load comfortably. When you're hunting ulua at Makaha or shooting for big kahala, go 8mm. A big ulua will bend a 7mm shaft on a bad shot. Don't give the fish that advantage.
Always rinse your shaft after every dive. Hawaii's saltwater is aggressive on metal. A little freshwater and a wipe-down extends the life of your gear significantly.
Trigger and Handle: Hold It Before You Buy
The trigger should break clean — no creep, no mush. A bad trigger turns into a jerked shot, and a jerked shot turns into a wounded fish and a lost shaft. Pick up the gun. Point it safely. Dry-fire the trigger. If it doesn't feel right in your hand, keep looking.
The handle should sit naturally in your grip. Some divers prefer pistol grips, others prefer a longer handle for better control at depth. There's no universal answer — only what works for your hand and your shooting style.
Reel or Shooting Line?
For most Oahu reef diving, a 3–5 meter shooting line (spectra or mono) connected to a dive float is the standard setup. Simple, reliable, keeps you connected to the fish and visible to boat traffic.
A reel earns its place when you're hunting deeper or going after big fish that run. At Makaha or Portlock hunting ulua, a reel with 15–20 meters of line gives you the ability to manage a powerful fish without losing your shaft. It adds complexity but pays off on serious fish.
Our Pick: Hammerhead Evolution2
The Hammerhead Evolution2 is what we recommend for most Hawaii divers. It handles the full range of Oahu conditions — from working shallow reef at Nānākuli to going two bands deep off Portlock for kumu and mu. Clean trigger, solid build, holds up to Hawaii's saltwater environment. This is the kind of gun you take to Makaha on a calm morning and feel ready for whatever shows up on the ledge — whether that's a papio or a big ulua.
Build the Full Setup
The gun is step one. You also need the right wetsuit (the HSD Hybrid is built for Hawaii freediving — flexible enough for depth, warm enough for extended time in the water), a low-volume mask for comfortable equalization, a weight belt dialed to your buoyancy, and a float with a flag. At Hana Paʻa, we walk you through the whole setup.
Come in. Tell us what spots you're planning to fish and what you're after. We'll dial you in right.
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