How Much Is a Glock 21 Worth? (2026 Value Update)

How We Calculate Used Glock 21 Value

The value of a Glock 21 is affected by its condition, variant, generation, and accessories.

Condition and Value

A Glock 21 will nearly always be worth more if it’s in good condition. If you don’t know what grade yours falls into, get a professional appraisal.

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

Some services charge for this, but we do it for free and online. If you’re already aware of what your gun’s condition is, though, you can just use the guide below.

Like-New or Mint

A new or mint G21 has seen zero use. It has no marks and is in perfect condition. It has the highest value for preowned guns.

Excellent

An excellent-condition handgun is one with so few marks that you have to really inspect it to find them. It's worth up to 10% less of mint.

Very Good

This is a lightly used pistol with some noticeable wear or use marks, but not serious ones. It's worth up to 120% less of mint.

Good

A good-condition G21 has been used a lot but not abused. If it’s been maintained and cared for well enough, it's worth up to 30% less of mint.

Fair

This is a gun that’s been used a lot and never really cared for. If it’s banged up and wasn’t maintained well, the most you can get for it is up to 40% less of mint.

Poor

This is a gun with serious problems: rust, deep scratches, dents, perhaps even non-working parts. You’ll be lucky to get 50% of mint value.

How We Appraise Glock 21 Models

There are three variants of the G21: the standard, the SF or short-frame, and the MOS.

Glock 21 Standard Value

The average used Glock 21 Standard is worth $150 to $380. A new G21 Standard sells for $550 at retail.

The standard G21 is the base version of the gun. You get a 13-round mag, a reversible magazine catch for ambidextrous use, and a 4.61-inch barrel.

Glock 21 SF or Short-Frame Value

The average used Glock 21SF is worth $150 to $380.  A new G21 SF sells for $550 at retail.

This is the reduced-circumference version of the G21. You basically get the same features otherwise – same mag capacity, barrel length, etc. – but in a smaller gun that’s easier to control. That’s why they sell for much the same, used and new.

Glock 21 MOS Value

The average used Glock 21 MOS is worth $300 to $550. A new G21 MOS sells for $700 at retail.

MOS stands for Modular Optic System, which means this is the version of the G21 designed to make mounting optics easy. The other two versions aren’t optics-ready, which explains why this commands a higher value.

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.

The Impact of Generation

There are four possible Glock generations for the G21: 2nd, 3rd, 4th, and 5th Gen.

Glock 21 Gen 2

The average used Glock 21 Gen 2 is worth $150 to $300.

This is the earliest version, identifiable from its flat front strap and lack of an accessory rail. This version also lacks thumb rests and uses the subtle pebble texture on its grip panels. It’s no longer in production.

Glock 21 Gen 3

The average used Glock 21 Gen 3 is worth $180 to $400.

G21 Gen3 guns were made from around 1995 to 2010 and add the accessory rail, finger grooves in the front strap, and thumb rests. They can also come in the RTF or rough-textured finish for the grip panels.

Glock 21 Gen 4

The average used Glock 21 Gen 4 is worth $200 to $500.

Gen 4 G21s started being manufactured in 2010 and offer added backstraps. The easiest way to tell them apart from earlier generations is the slide, which has “Gen 4” on it.

Glock 21 Gen 5

The average used Glock 21 Gen 5 is worth $200 to $550.

Gen 5 G21s have a telltale stamp on the slide, like the Gen 4s. They have other differences, like no finger grooves, more ambidextrous features, and MOS versions (which are worth the most).

How Accessories Affect What We Pay for Your G21

Some things can bring up the price of your Glock pistol. Here are the ones most people will be interested in and how much you may be able to sell them for.

Extra Magazines

Glocks are shooters, first and foremost. More mags are always popular, so don’t hesitate to throw them into your package if you can.

Value: Around $10 per mag

Weapon Light

Weapon lights are among the more useful accessories for this gun, but only the good ones from known brands will generally add value. If yours is something like a TRL-1 HL ($170 retail) or a Surefire X300 ($370 retail), it’s worth adding.

Value: Around 30% to 50% of retail

Optics

This is obviously only useful if your G21 is an MOS version or one you’ve had modified for optics mounting. If it is, you can often sell an optic with it. Just keep in mind that most people won’t care for it unless it’s from known brands like Holosun.

Value: Around 30% to 50% of retail

The Process to Sell a Glock 21 to Us

Selling a Glock 21 houldn't be complicated. Whether you have a standard Gen 2 or a Gen 5, 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.