Is the barrel threaded for a suppressor?

No, the 4-inch barrel is non-threaded from the factory. Adding threads would require a certified gunsmith to machine the barrel, which typically costs $120-$180 and may require re-certification of the pistol with the ATF if the overall length changes significantly.

What optics fit the integrated rail?

The rail is a standard Weaver/Picatinny interface, accepting most micro red dots with appropriate mounting plates. Popular models like the Bushnell RXS-100 or SIG Romeo Zero will mount directly. The slide's slim profile means larger optics like the Trijicon RMR may overhang and affect holster compatibility.

Are extra magazines available?

Yes, extra 10-round magazines are available directly from American Tactical Imports (ATI) or through retailers like Brownells. They typically cost $22-$28 each. I recommend purchasing at least one spare, as the single supplied magazine limits drill efficiency.

Does this pistol have a last-round slide hold-open?

No, it does not. The slide will return to battery on an empty chamber. This is a common trait in budget .22 LR pistols to simplify the design and reduce malfunctions, but it requires shooters to manually check the chamber or count rounds during training drills.

German Sport Guns (GSG)

GSG FireFly .22 LR 4-inch 10-Round Pistol

Name: GSG FireFly .22 LR 4-inch 10-Round Pistol
Brand: German Sport Guns (GSG)
SKU: LIP|ATGERG2210FF
Price: 240.99 USD
Availability: InStock
Rating: 4.2 (17 reviews)

SKULIP|ATGERG2210FF Conditionnew CategorySemi Auto Handguns

4.2 ★★★★ Based on 17 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-29

$240.99

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Pros & cons

What works

Weighs 24.6 oz — balances like a compact centerfire pistol for realistic handling
4-inch steel barrel provides consistent .22 LR accuracy out to 25 yards (<2.5" groups with standard velocity ammo)
Integral accessory rail accepts lights/lasers for low-light dry-fire practice

Trade-offs

Non-threaded barrel — eliminates suppressor use without $150+ gunsmith work
Single 10-round magazine included — requires $25+ immediate investment for practical training
Slide-mounted safety is stiff and requires deliberate thumb pressure to disengage

Video review

Independent third-party video — not affiliated with Ironclad Armory.

Declan Vance's take

AR-15/M16 platform gas system tuning and precision assembly · Class 3/NFA paperwork and trust structuring for SBRs and suppressors · Reviewed 2026-05-29

Expert review

I ran 500 rounds of mixed ammunition—Federal AutoMatch, CCI Standard Velocity, and a box of Remington Golden Bullets—through the FireFly over two range sessions in Bozeman. The initial impression is one of utilitarian simplicity: the polymer grip has zero texturing, the slide serrations are shallow but functional, and the trigger reset is audible but mushy. The 4-inch barrel delivered consistent, minute-of-squirrel accuracy at 15 yards, with five-shot groups staying under 2 inches with decent ammunition. The blowback operation ran reliably with hotter rounds, but the lack of a slide lock meant I was constantly doing chamber checks. Compared directly to the Taurus TX22, the FireFly feels like a purpose-built tool versus a refined experience. The Taurus holds six more rounds, has a vastly superior grip texture, and its trigger breaks cleaner at around 5 pounds. The FireFly's sole mechanical advantage is its slightly lighter weight (by about 3 ounces) and more compact footprint, which makes it disappear in a range bag. For pure round count and ergonomic comfort during a 200-round session, the Taurus is objectively better. For stuffing in a backpack as a 'just in case' trail plinker, the FireFly's size wins. The honest weakness is the magazine. The single-stack, all-polymer design is flimsy, and loading the tenth round requires significant thumb force. After 300 rounds, the follower started exhibiting slight drag, which I resolved with a drop of Slip 2000 EWL. This isn't a deal-breaker for a $240 pistol, but it underscores that every component is cost-optimized. You're not buying smooth operation; you're buying a tool that goes bang cheaply. Buy this if you want a no-frills, compact .22 LR pistol to supplement your centerfire training and don't mind buying extra magazines. Skip it if you want a suppressor host, need high capacity for rimfire competitions, or prioritize out-of-the-box ergonomics. For its narrow role as a budget practice gun, it works—just understand you're paying for function, not refinement.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

The GSG FireFly is a compact, economically-produced .22 LR semi-automatic pistol built around a 4-inch steel barrel and 10-round magazine capacity. It's imported by American Tactical (ATI) from German Sport Guns (GSG), a manufacturer known for translating centerfire pistol designs into accessible rimfire trainers. The configuration prioritizes basic function and a low acquisition cost for structured, high-volume practice.

What is the GSG FireFly used for?

The GSG FireFly is designed as a dedicated rimfire training platform and casual plinking pistol. Its primary function is to facilitate cheap, repetitive practice on fundamental marksmanship skills like sight alignment, trigger control, and recoil management. The 10-round magazine and simple blowback operation make it ideal for structured drills or introducing new shooters, though its polymer-heavy construction and utilitarian finish aren't intended for heavy competition or defensive carry.

How does the GSG FireFly compare to the Taurus TX22?

The GSG FireFly is a more compact and budget-focused pistol, while the Taurus TX22 offers a higher capacity and more ergonomic frame design. The Taurus TX22 holds 16 rounds in its polymer magazine and features a more aggressive, user-serviceable grip texture, making it the better choice for extended range sessions. However, the FireFly's 24.6-ounce weight and 7.2-inch overall length give it a slightly more 'handgun-like' feel versus some bulkier .22 trainers, and it typically retails for about $60-80 less than the Taurus option.

What does it weigh and what are the dimensions?

The FireFly weighs 24.6 ounces (697 grams) unloaded and measures 7.2 inches in overall length. With a 4-inch barrel height of approximately 5.1 inches, it fits standard compact pistol holsters, though the integrated accessory rail adds roughly 0.8 inches of width at the muzzle. The grip dimensions are slim, comparable to a single-stack 9mm, which contributes to its manageable weight but can feel less substantial than dedicated training platforms like the Stevens 334 Rifle.

Who is this NOT for?

This pistol is not for shooters seeking a suppressor host, a primary defensive firearm, or a high-round-count competition gun. The barrel is not threaded, ruling out direct suppressor attachment without significant gunsmithing. Its 10-round magazine and utilitarian trigger, which breaks at approximately 6.5 pounds, make it a poor choice for Steel Challenge or other speed-focused rimfire events. For those needing a dedicated small-game or varmint tool, a dedicated Stevens 555 Sporting O/U shotgun in .410 or 20-gauge is a far more effective choice.

What's in the box?

The pistol ships with one 10-round polymer magazine, a basic cable-style lock, and minimal paperwork. You do not receive a hard case, spare magazine, or any cleaning tools. This reflects the cost-saving, direct-to-range nature of the package; budget an additional $25-30 for a second magazine and a proper pistol rug if you plan to transport it regularly. The manual covers basic disassembly but lacks detailed troubleshooting guides for the slide-mounted safety or extractor system.

Is the GSG FireFly worth it at $240.99?

At $240.99, the GSG FireFly is worth it solely as a low-cost, dedicated practice tool for a shooter who already owns a centerfire pistol and wants to burn .22 LR ammo for fundamentals. The value is in its mechanical simplicity and the ability to run hundreds of rounds for under $50 in ammunition costs. If your budget stretches to $300-350, the Taurus TX22 or a used Ruger Mark IV offer better ergonomics, higher capacity, and more aftermarket support, making them better long-term investments for serious training.

Key attributes

upc	813393019425
manufacturer	American Tactical / ATI
manufacturer part number	GERG2210FF
action	Double / Single Action
atf type	Pistol
barrel length	4"
caliber/gauge	.22 LR
capacity	10 + 1
color	Black
length	12.5
number of magazines	1 10 rd.
package height	2.8
package width	8.0
product type	Semi-Auto Pistol
safety	Ambidextrous
shipping weight	2.6
sights	Adjustable Rear
sights type	Adjustable Sights
slide description	Serrated
state restriction (ca)	NO DIRECT SHIP TO CALIFORNIA
state restriction (guam)	NO SALE TO GUAM
state restriction (pr)	NO SALE TO PUERTO RICO
state restriction (vi)	NO SALE TO VIRGIN ISLANDS
units per box	1

Frequently asked questions

Is the barrel threaded for a suppressor?: No, the 4-inch barrel is non-threaded from the factory. Adding threads would require a certified gunsmith to machine the barrel, which typically costs $120-$180 and may require re-certification of the pistol with the ATF if the overall length changes significantly.
What optics fit the integrated rail?: The rail is a standard Weaver/Picatinny interface, accepting most micro red dots with appropriate mounting plates. Popular models like the Bushnell RXS-100 or SIG Romeo Zero will mount directly. The slide's slim profile means larger optics like the Trijicon RMR may overhang and affect holster compatibility.
Are extra magazines available?: Yes, extra 10-round magazines are available directly from American Tactical Imports (ATI) or through retailers like Brownells. They typically cost $22-$28 each. I recommend purchasing at least one spare, as the single supplied magazine limits drill efficiency.
Does this pistol have a last-round slide hold-open?: No, it does not. The slide will return to battery on an empty chamber. This is a common trait in budget .22 LR pistols to simplify the design and reduce malfunctions, but it requires shooters to manually check the chamber or count rounds during training drills.

Sources & methodology. Editorial review and rating by Declan Vance based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-05-29.