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What Are Fin Grips & Why Use Them?

We take a look at what fin grips are and why gun owners in states like California have to use them for their ARs...

It’s time to talk about fins! Nope, it’s not Shark Week, but that’s not the only place you’ll find fins aplenty!

For those not fortunate enough to live in a free state, fin grips are an important part of a featureless rifle build.

Strike Industries Megafin Featureless Grip
Strike Industries Megafin Featureless Grip

But what are they, and how did they come about? In this article, we’ll explain what a fin grip is, why they’re used, and the laws behind them.

So, keep reading.

Table of Contents


What Is a Fin Grip?

A fin grip is a type of pistol grip often used on featureless rifles in California and New York.

The grip is essentially the standard pistol grip you would find on rifles in free states, with an added piece of plastic sticking out the back, like a shark fin, hence the name.

CA HD AR Strike Industry Megafin
Strike Industry Megafin

So why would someone attach this to their rifle?

In states like California and New York, there are plenty of laws on rifles and long guns in general.

Part of those laws involves the pistol grips on rifles. Specifically, the states consider semiautomatic rifles with “a pistol grip that protrudes conspicuously beneath the action of the weapon” to be “assault weapons.” 

As “assault weapons,” the rifles must be registered with the state (California or New York, whichever one you’re stuck in).

Best Featureless Grips
A Few of Our Featureless Rifles

If the rifles are not registered, they are illegal in the eyes of the state government and must be forfeited — or you’ll be given a big fine and possibly some jail time.

Registration doesn’t seem too bad, except for the fact the government will have even more information on you and your firearms.

Also, it means you aren’t allowed to transfer, in either state, a registered assault weapon to anyone else in the state unless it is to surrender it to law enforcement, to sell it to an FFL, or to transfer or sell to someone outside of California or New York.

Oh, and you’re not allowed to make any additional modifications to the rifle once you’ve registered it.

Modded AR-15s
Once you register, you can’t mod.

There are also no exceptions for transferring or passing on registered “assault weapons” to family members.

So, unless they live outside the state, you will be giving up the rifle at some point — voluntarily surrendering or transferring it, or the state will take it off your hands when you’re gone.  

“Assault Weapons” & Grips

There’s also the issue of not being able to actually purchase an “assault weapon.” Firearms manufacturers had to get creative to continue selling rifles in states like California and New York.

Adjustable AR-15 Buttstocks

What the firearms industry came up with were pistol grips that met the requirements of the laws but still kept rifles somewhat functional.

Initially, there were grips like the Hammerhead grip, which met the requirements but weren’t very comfortable to use.

Exile Machine Hammerhead Grip, Left
Exile Machine Hammerhead Grip

There were also other options like the Thordsen stocks, which basically made the pistol grip part of the buttstock.

Eventually, fin grips came along and made life a little more manageable.

Fast forward a few years, and there are now tons of grip options, with the most popular being the fin grips.

This is due to the fact they are probably the closest you can come to an actual pistol grip while living in California and New York…and most of them aren’t that expensive.

Best Featureless Grip
at Primary Arms

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Final Thoughts

Maybe one day, the only fins in California and New York will be the ones we see on Shark Week. Until then, for those of you looking for some grip ideas, definitely check out our reviews on grips for featureless rifles.

Gripping the Strike Industries Megafin
Gripping the Strike Industries Megafin

None of them can offer the simplicity of the classic pistol grip, but a few do come pretty close, so it’s worth a look.  

What’s your take on fi grips? Let us know in the comments below. Looking for featureless grips for your AR? Head over to our Best AR and AK Featureless Grips article.

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9 Leave a Reply

  • Commenter Avatar

    Guns and gun owners have two enemies: rust and politicians.

    September 15, 2022 11:12 am
  • Commenter Avatar
    Chuck Cochran

    I was born in Santa Monica and moved to the former Colorado (now Commierado) at age 6. I thank God every day, my parents ditched that Schitthole in 1966. Commierado's working on it though, but hopefully Brueun will put an end to some of their BS.

    September 11, 2022 7:09 pm
  • Commenter Avatar
    Michael Clay

    I am so happy I live in the free state of Texas .

    September 11, 2022 5:35 pm
  • Commenter Avatar
    Mark Nighswonger

    Would bullpup designs, with a thumb hole in the stock, be a legal option?

    September 11, 2022 6:13 am
    • Commenter Avatar

      I can't speak for NY but in California a thumbhole stock in considered an "assault feature" and is therefore prohibited on a semiautomatic rifle firing a centerfire cartridge with a detachable magazine.
      There is a bullpup rifle from Kel-Tec that's shaped to accommodate a more traditional grip on the stock, but usually people just make kydex wraps for the pistol grip on bullpups to make them compliant with CA law (I'd say just look up a CA compliant Tavor or AUG to see what I mean but don't forget your eye pro because it visually hurts).
      The P90s get it worse because they get a wrap on the thumbhole to block it off as well as the forward grip to prevent it from being a vertical grip (as those are also "assault features").

      PS Please don't let California law become federal law: vote when you can and write to your senators whenever an Assault Weapon ban gets proposed.

      September 11, 2022 2:58 pm
    • Commenter Avatar

      If it can be gripped on the rifle meaning like when you close your hand and part of the grip is the thumb being able to do what thunbs do in a grip around something, then its probably not a legal thing in California.

      September 13, 2022 1:56 pm
  • Commenter Avatar

    Inb4, "I would take that off as soon as I got home. Don't follow unconstitutional laws, brother!"

    Might as well put a stock on a pistol while you're at it, brother.

    September 10, 2022 7:31 pm
  • Commenter Avatar

    As a CA. resident that just bought 1st AR. they suck.But, really simple to replace and think with lots of shooting time not that hard to adjust too..

    September 10, 2022 6:46 pm
    • Commenter Avatar

      Granted, but it does suck when you try transitioning shoulders or when you try to hold up your rifle one-handed while reloading. I'm really hopeful this goes away, or somehow California decides to go back to giving us one "assault feature" to make rifles that much more ergonomic.

      September 11, 2022 3:00 pm
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