There is no single best speargun size. The right length is the one matched to where you dive, how far you can see and the fish you are chasing. Get that match right and everything else gets easier: better shots, less frustration, more fish on the stringer.
Railguns
Railgun sizes at a glance
Every size, what it is best for, the visibility and fish it suits, and the Aimrite guns we would put in your hands.
Size
Best for
Visibility
Target species
Recommended Aimrite guns
60–70cm
Tight reef, caves, dirty water
1–5m
Bream, Flathead, small reef fish
Envy Pro Railgun
80–90cm
Small reef / coast gun
3–8m
Salmon, Barra, Jewfish, Jacks
V3nom, Envy Pro
100cm Most popular
The most versatile size
5–12m
Coral Trout, Reef Fish, Kingfish
V3nom, Envy Pro
110cm
Clear water reef & light bluewater
8–15m
Mackerel, Cobia, Small Pelagics
V3nom, Envy Pro, Vendetta King
120cm+
Bluewater hunting
12m+
Wahoo, Dogtooth Tuna, Marlin
Vendetta King, King Venom, Retribution
Rollerguns
Rollergun sizes at a glance
Every size, what it is best for, the visibility and fish it suits, and the Aimrite guns we would put in your hands.
This is the one most people get wrong. Your effective range is roughly two to three times the water clarity, so your visibility, not the fish, sets how much gun you can actually use. In dirty, surgy water a long barrel is a liability that you cannot aim or swing. In clear water, that same length becomes reach you will be glad you have. If you only remember one thing from this guide, make it this: match your gun to the visibility, not just the fish.
Then think about your target fish
Bigger fish need more range and more penetration, which usually means a longer gun, a heavier shaft and more bands. Smaller reef fish reward the opposite: a shorter, nimbler gun you can point and shoot in tight country. Be honest about what you actually chase most weekends rather than the once-a-year trip, and size for that.
And where you actually dive
Tight reef, caves and estuaries want a short gun you can whip around structure. Open water and bluewater want length and shaft speed. Most Australian shore divers spend their time somewhere in the middle, on reef and headlands with moderate visibility, which is exactly why the mid-range sizes are so popular. Pick for your most common dive, not your dream one.
The short guns: 70 to 80cm
Built for reef holes, caves, low visibility and shore diving. The short barrel lets you swing fast and stay accurate around structure, where a longer gun just gets in the way. It is also the most forgiving size to learn on, and it handles coral trout, reef fish and estuary species with ease.
Suggested pickV3nom, Envy Pro, Envy Roller
The all-rounders: 90 to 100cm
The sweet spot for Australian conditions and our most popular size, and for good reason. A 90 to 100cm gun balances real power with the versatility to handle mixed reef and light bluewater, so it is the gun most divers reach for weekend after weekend. If you are buying one gun to do almost everything, this is it. It comfortably covers coral trout, mackerel, snapper, sweetlip and cobia.
Out wide you rarely get close to the fish, so you want the shooting range and shaft speed to reach out and the power to land big pelagics cleanly. This is where a roller earns its keep: it holds power through more of the shot for a flatter, harder-hitting result. Rig it with a proper float and reel and you are set for wahoo, tuna, Spanish mackerel, mahi mahi and dogtooth.
The other question we get more than any. A railgun keeps the shaft tracking straight for simple, accurate, fast-reloading shooting, which makes it the easiest gun to learn on and the natural choice for reef and inshore water. A rollergun routes the rubbers over a muzzle roller for more power and range from the same barrel length, with reduced recoil, so it shines in clear water and on bigger fish.
Railguns: simple, accurate, versatile. Fast reloads, lightweight, ideal for reef and inshore, and the easiest first gun to learn on.
Rollerguns: more power and range from the same length, with reduced recoil. Built for clear water and bigger fish.
New to spearfishing? Start here
Start with a 90cm or 100cm railgun. It is easy to handle, accurate, and versatile enough to grow with you as your diving improves. You can always add a longer roller for bluewater down the track, but this one gun will teach you the most and land you the most fish while you learn.
Why buy from Aimrite
We are a proudly Australian-owned, veteran-run family business, and every gun is hand-built by our team in Cairns. Each one is backed by a lifetime warranty and over 450 five-star reviews, because if it is not built to last a lifetime, it does not leave the shed. Still weighing it up? Talk to one of our team, actual spearos who dive these waters themselves.
Shop the range
Guns built to last a lifetime
Hand-built by our veteran-run team in Cairns and backed for life.
Match your gun size to the visibility, not just the fish.
25+ YRSDesigning spearguns
450+Verified 5-star reviews
100%Australian owned
LIFETIMESpeargun warranty
Common questions
Speargun size FAQ
What is the best all-round speargun size?
For most Australian divers, 100cm is the do-it-all size. It balances power and versatility across mixed reef and light bluewater, which is why it is our most popular gun.
What size should a beginner get?
Start with a 90cm or 100cm railgun. They are easy to handle, accurate and versatile enough to grow with you.
Does a longer speargun mean more power?
No. Power comes from band stretch and setup, not barrel length. Buy the length your visibility justifies, then tune the rubbers for punch.
Railgun or rollergun for me?
Choose a railgun for reef, inshore water and small to medium fish. Choose a rollergun for clear water, longer range and bigger fish. If hunting big fish in dirty water like Jewfish and Barra then a 85-95cm Roller will be much better.
What size do I need for bluewater?
120cm and up. Out wide you rarely get close, so you want the range, shaft speed and power to land big pelagics cleanly.
Are Aimrite spearguns made in Australia?
Our spearguns are all designed and built in Cairns FNQ and backed by a lifetime warranty. We are proudly an Australian-owned business.
Still not sure which gun?
Tell us where you dive and what you are chasing. One of our team, actual spearos who dive these waters themselves, will point you at the right rig.
