How Much Is a Glock 31 Worth? (2026 Value Update)

How We Calculate Used Glock 31 Values

Glock 31 value is affected by the gun’s condition, variant, and its accessories or upgrades.

Condition and Values

The worth of a Glock 31 is directly related to its condition. The better the condition, the higher the value of the gun.

You can have a firearms professional grade your pistol’s condition, but they may charge a fee for that. We do it for free at Cash for Arms if you offer your gun to us.

To see how we professionally evaluate your firearm (for free) and turn that condition into a payout, view our 3-step selling process for a guaranteed FFL offer.

Once you know the grade, use these tiers to estimate value:

Like-New or Mint

• The best prices for preowned guns
• Never used, no wear or marks
• Perfect form and function

Excellent

• About 10% less than mint
• Very rarely used, barely marked
• Near-perfect form, perfect function

Very Good

• About 20% less than mint
• Used lightly, some mild wear
• Perfect function

Good

• About 30% less than mint
• Used often, cared for properly
• Perfect function

Fair

• About 40% less than mint
• Used regularly, never cared for
• May have slight functional issues

Poor

• About 50% less than mint
• Noticeably worn, dented, or rusted
• May not even be functional

How We Appraise Glock 31 Models

There are four Glock 31 models or variants. Since the gun was introduced only with Generation 3, there are only Gen 3 and Gen 4 versions. Glock never made a Gen 5 version.

Glock 31 Gen 3 Value

The average used Glock 31 Gen 2.5 is worth $210 to $400. A new Glock 31 Gen 3 costs around $500.

These were the first Glock 31 handguns. The 10-round version is California-legal (though the standard version actually holds 15 rounds).

This makes them fairly popular with Californians seeking a gun that hits a little harder than 9mm… if they’re willing to put up with the cost of the ammo.

Glock 31C Gen 3 Value

The average used Glock 31C Gen 3 is worth $250 to $450. A new Glock 31C Gen 3 costs around $550.

This is just the compensated version of the Gen 3 G31. The barrel has venting ports that align with cutaways in the slide. The goal is to reduce flip and improve target reacquisition.

Glock 31 Gen 4 Value

The average used Glock 31 Gen 4 is worth $220 to $400. A new Glock 31 Gen 4 costs around $500.

This was the latest version of the 33 before it was discontinued. It added features like modular backstraps, a new recoil spring assembly, and a reversible mag release. This version also shipped with three mags instead of two.

This means a lot of its parts aren’t interchangeable with the Gen 3 G31 ones.

Glock 31C Gen 4 Value

The average used Glock 31C Gen 4 is worth $260 to $450. A new Glock 31C Gen 4 costs around $550.

Just the ported or compensated version of the Gen 4 model. Other than that, it’s identical to the regular Gen 4 Glock 31.

This is a model that holds value well. Because it’s a premium firearm in the line, we use a secure gun shipping and buying system to ensure every transaction is fully insured and legally compliant.

How Accessories Affect What We Pay for Your G31

Some accessories can bring up preowned Glock 31 value. That’s why people selling the gun often bundle items with it.

But it will still depend on the buyer, as some only want the gun, not the extras. If your accessories are also worn or are from unknown brands, expect a haircut as a seller.

Original Box and Papers

Not all buyers will think they should pay for this, but if your box is in pristine condition or near it, you might be able to add a bit more to your Glock 31’s price.

Value: Around $10 to $25 for the matching box and papers.

Mag Extensions

If you have ones like the +2 extensions from GlockStore, some buyers might be interested.

Value: Around 20% to 40% of the accessory’s original value.

Spare Magazines

Many buyers will happily pay for more .357 SIG magazines. You can get more for higher-capacity mags.

Value: Around $10 to $15 per used mag.

Conversion Barrels

Since these can make your Glock 31 much more versatile (even to the point of using three calibers for one gun!), a lot of buyers appreciate them. Good-quality ones like those from Bear Creek Arsenal are particularly popular.

Value: Around 30% to 50% of the accessory’s original value.

The Process to Sell a Glock 31 to Us

Selling a Glock 31 shouldn't be complicated. We provide a streamlined process that handles the heavy lifting for you.

• Step 1: Get an instant quote based on your gun’s specific model and condition.
• Step 2: Accept our offer and ship your gun with our prepaid label.
• Step 3: Get paid the same day we validate it.