In Speargun reviews, Spearguns

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Today I’m going to cover one of my favorite spearguns, the Rob Allen Tuna Railgun.

You can’t go wrong with the Rob Allen brand when it comes to spearguns. They just do it right. Rugged. Versatile. Pretty-much bomb proof. All qualities that have helped my own Rob Allen speargun survive countless trips out on the reef and in the deep blue. Oh, and help me catch plenty of fish too.

Just get to it already…

Here’s the speargun you need to buy.

It’s that damn good it made runner-up in our buyers guide to the best spearguns on the market.

Rob Allen Aluminum Tuna RAILGUN Speargun with Open Muzzle - All Lengths (110CM)
29 Reviews
Rob Allen Aluminum Tuna RAILGUN Speargun with Open Muzzle - All Lengths (110CM)
  • Aircraft grade aluminum
  • Wall thickness of 1.45 millimeters
  • Latest Vecta 2 Trigger Mechanism
  • 2X POWER BANDS: 5/8" (16 millimeters)
  • 7mm Spring Steel Shaft

And here’s why.

  • Reinforced aluminium barrel helps evert shot fly straight and true
  • Coming stock with two rubber bands it’s basically an underwater bazooka
  • Railgun design gives you a manoeuvrable speargun that’s perfect in shallow reefs
  • More than powerful enough for deep water spearfishing if the situation calls
  • Built from high quality materials that will last season after season

Right. Now if that wasn’t enough here’s a bit more background on the Rob Allen Tuna Railgun.

Behind the brand

Rob Allen is one of my favorite brands when it comes to spearfishing.

For anyone who is just getting into this lifestyle, Rob Allen is like a household name. Pretty much every spearo I know has at least one of his guns in their collection, as the brand has been around forever. He spent his youth on fishing boats up and down the coast of Africa, chasing big game fish that sparked his life-long passion for spearfishing. But like any great master, the tools of the trade weren’t up to par, so he started tweaking them to suit, which progressed into his own line of spearguns.

But not just any spearguns. He designed rugged, hardcore products that would last when you’re out chasing the big pelagic fish. For me, that’s the most important part. When I’m spending a few hundred dollars on a piece of spearfishing equipment, I want it to last more than a single season. I don’t want to be buying another speargun in a couple of years time, and I definitely don’t want it to fail when I’m out in the water.

Today of course they produce far more than just spearguns, but my favorite product of his remains the Rob Allen Tuna Railgun.

Invest in a Rob Allen speargun. They just work.

What’s a railgun?

When you’re chasing big fish, you need power, range and accuracy.

The railgun was developed as an alternative to the bulky wooden guns, without costing a fortune. People even say Rob came up with the original idea for this gun, which only goes to show how determined he is to continue improving his range of spearguns.

Instead of a normal piece of aluminium tubing, a railgun has a “rail” incorporated into the barrel that helps to strengthen and support the weight of the shaft. This means you can get a longer gun, with stronger rubbers, without compromising the accuracy of your shots.

The rail guides the shaft when the speargun is fired, ensuring every shot you take is launched perfectly straight. This does have an unfortunate effect though, as the gun is a tad noisier when you fire it (all things considered).

Rob Allen’s Railguns

Now there’s a handful of different railguns that Rob Allen makes, and the first key difference is the barrel material. You can choose carbon or vecta aluminium. In my opinion the only real difference is the price, so I opted for the Tuna Railgun as it was a couple of hundred dollars cheaper.

The only time I’d recommend going with a carbon speargun is if you’re out hunting the big pelagics and are after a big gun. I’m talking like a 1600mm barrel. Then the Zulu is one of the best in the world. It’s noticeably lighter in your hands and just feels a little better in the water.

But for a versatile gun you’d be best suited with the vecta aluminium 1200mm Tuna. The dual rubbers it comes with make it a stand-out for me, and it’s big enough to allow for long range hunting, while packing a hell of a punch. I compared it with the more popular Sparid version that everyone seems to have, but after using both I felt like the Tuna was a little more “solid” and the added power of the extra rubber was a no-brainer.

The Rob Allen Tuna Railgun

Straight off the shelf the speargun comes fully rigged and ready to go. If you’re totally new to the sport of spearfishing don’t let the dual-bands frighten you. They’ll improve your range and help you land more and more fish. Which is a good thing.

The 1200mm I have is perfect for zooming around the reef along with open water hunting. I don’t like taking my big guns out unless I’m specifically going after the big pelagics, but at this size it’s quite a versatile gun that’s my go-to whenever I’m sneaking in a quick dive.

Remember, 1200mm is the barrel length. With the spear in it comes to 1780mm when you measure it from handle to tip, which is just as tall than me. It’s not a little gun by any means, but if you prefer something smaller they offer barrels from 900mm to 1400mm. Choose the right size for you.


The cost of the Rob Allen Tuna Railgun will differ based on the length of the gun you want to buy. The 110cm model is detailed below.

Rob Allen Aluminum Tuna RAILGUN Speargun with Open Muzzle - All Lengths (110CM)
29 Reviews
Rob Allen Aluminum Tuna RAILGUN Speargun with Open Muzzle - All Lengths (110CM)
  • Aircraft grade aluminum
  • Wall thickness of 1.45 millimeters
  • Latest Vecta 2 Trigger Mechanism
  • 2X POWER BANDS: 5/8" (16 millimeters)
  • 7mm Spring Steel Shaft

General specs

  • Open muzzle (which can be swapped out for the new low-profile muzzle)
  • Rob Allen Vecta handle with laser cut stainless sear and top-mounted safety
  • Double 16mm rubber bands
  • 7.5mm spear (double notch) hardened to 2,000 MPA
  • Rail track spans full barrel length
  • Shockcord bungee and 400lb shooting line

The handle

One of the best parts of the Tuna Railgun is the handle Rob Allen designed. Throwing his years of experience into this new concept, what I like best is there’s no “click” when you fire. Nearly every other speargun I’ve fired makes a noise when you pull the trigger, which can spook the fish.

The handle is crafted out of glass-reinforced nylon, making it essentially bullet proof. This is to ensure it’ll hold up under the enormous strain you’ll be putting it through on every dive. There’s also very few moving parts within the trigger mechanism, so it’s easy to flush out and clean with a hose when you’re back on dry land.

What is particularly nice though is where your hand sits. There’s no “finger ridges” cut into the plastic, which means it’ll fit you no matter how big (or small) your hands are, and you can hold the speargun at different angles without feeling like it’s going to slip out of your grip.

The spear

It goes without saying that a dead spear is a bent spear. The team at Rob Allen know this, and build some of the strongest spring steel spears you can buy. The Tuna Railgun comes with a 7.5mm spear, with more than enough space between the tip and the flopper. I had a kingfish saw itself off another spear from a different brand that will go unmentioned because these were too close together.

The floppers on the Rob Allen spears have been designed to help your spear fly true, and will jam open after passing 45 degrees which means there’s little chance you’ll lose the fish because it simply flopped closed again.

The barrel

Strength is everything when it comes to your barrel, as it’s the backbone of your gun. Even a tiny amount of flex can throw your shot off, which is why it’s so important to keep it stiff and rigid. The vecta aluminium the Rob Allen Tuna Railgun is made from is aircraft grade aluminium, and is 1.45mm thick within the walls. This is further strengthened with the rail that runs along a top, which not only acts as an additional support, it helps guide the spear to shoot fast and true.

The muzzle

The Rob Allen Tuna Railgun allows you to choose between an open or a closed muzzle, and it all comes down to personal preference.

I picked the open muzzle which means the mono line is what’s actually holding the spear down at the end of my gun. I like it because it reduces any loose “rattle” you sometimes get with a closed muzzle, and it’s also more streamlined in the water which makes it easier to follow the fish I’m after.

The bands

The speargun comes fitted with twin 16mm bands, and is the setup I’d recommend you keep when you’re using it. Just make sure you can comfortably load it, if you’re struggling or the factory bands come too tight, don’t be afraid to get them replaced. On this gun you’re going to want your band length to be around 65cm if you’re using the 16mm bands, or 75cm if you’re using the 20mm bands.

If you really want to swap out the twin bands, replace them with a single 20mm band. Just remember it’s going to be a little less forgiving to load, and you’re going to want to use a chest pad to avoid getting all bruised up after every spearfishing session.

How it actually feels to use

In the water, the Rob Allen Tuna Railgun is one of my favorites to use. Even though you’ll feel the weight when you’re walking around on dry land, the hollow barrel allows for just the right amount of buoyancy so it swings effortlessly through the water.

After you fire a shot the gun will float, and the setup is very easy to use and reload. For me, the 1200mm is the perfect length for diving around the reefs and headlands where I normally spearfish, and need to combat a little bit of surf. It’s almost a little too big, so if you’re worried about the size, maybe go with the 1000mm or 1100mm models.

But the best part is actually the trigger. It was easy to deactivate the safety (which I never use anyway), and I’ve found I’m a little like Goldilocks with this gun. It’s not too soft or too hard to pull. It’s just kind of right. A little tension, and thwack, you’re spear is barreling out towards whatever you were aiming at. And it’s deadly accurate.

The downsides

The only time I have a problem with the Rob Allen Tuna Railgun is when I relax. It’s a powerful speargun and if you’re not rigid when you shoot the recoil will send your shots a little high on the fish, which is a downside that’s going to be evident on any large gun.

It can also be a little difficult to master the loading techniques the first time you use this speargun. And watch out for the rubbers. I couldn’t stretch mine down past the halfway point in my first attempt to load this speargun, my advice would be to replace these with bands that are a little longer until you get the hang of it.

The bottom line

All up, I’d highly recommend the Rob Allen Tuna Railgun for anyone looking for a quality speargun that’s versatile enough to handle both reef diving and open water. Of course size will come into it, but I couldn’t be happier with my 1200mm model, and is what I’d recommend most spearo’s start out with if they’re looking to invest in a Rob Allen speargun.

Rob Allen Aluminum Tuna Railgun Speargun Review

Happy spearin’

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