Is it compatible with aftermarket choke tubes?

Yes, the Spandau S2 uses standard Beretta/Benelli Mobil choke threads. The included Carlson Bone Collector tube is a .665 constriction, but you can install any Mobil-pattern tube from brands like Carlson's, Patternmaster, or Trulock. Always verify thread compatibility with the manufacturer before purchase.

Does it fit in a standard 42-inch rifle case?

No, it will not. With an overall length of 41.5 inches, you need a case with at least 43 inches of internal length to accommodate the muzzle without compression. I recommend a Plano All Weather 42-inch case or similar, which provides 42.5 inches of usable space.

Can I use 2.75-inch target loads?

Yes, but reliability is not guaranteed. The inertia system is tuned for 3-inch magnum hunting loads. For consistent cycling with light 1-1/8 oz target loads, you must use the lightest action spring shim provided, maintain a firm shoulder mount, and often use ammunition with a minimum velocity of 1200 fps.

Does the receiver come with scope mount screws?

No, it does not. While the receiver is drilled and tapped with a standard #8-40 thread pattern, you must source the appropriate length mounting screws (typically 0.75-inch to 1-inch) separately from your optic mount manufacturer. Most Picatinny rail kits include these screws.

Is the TrueTimber Strata finish durable?

It is a hydro-dipped finish over a phosphate metal treatment, not a baked-on ceramic or hard anodizing. It provides excellent visual concealment but will show holster wear and scratches from brush contact more readily than a hard-coat finish. Expect noticeable wear on the receiver's high points after one full season of use.

Ironclad Armory

Spandau S2 12 Gauge 21 in. TrueTimber Strata w/ Bone Collector Choke

Name: Spandau S2 12 Gauge 21 in. TrueTimber Strata w/ Bone Collector Choke
Brand: Ironclad Armory
SKU: TSW|193313
Price: 607.99 USD
Availability: InStock
Rating: 4.3 (47 reviews)

SKUTSW|193313 Conditionnew CategorySemi Auto Shotguns

4.3 ★★★★ Based on 47 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-29

$607.99

Quantity

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

Pros & cons

What works

Includes a $65 Carlson Bone Collector choke tube pre-installed — ready to pattern.
Weighs 9.2 lbs — 1.8 lbs heavier than many 20-gauge turkey guns, significantly damping magnum recoil.
21-inch barrel provides a 7.5-inch shorter overall profile than standard 28-inch field guns for blind use.
Drilled and tapped receiver accommodates red-dot mounts without aftermarket gunsmithing.

Trade-offs

Inertia action requires specific technique — fails to cycle with light target loads if not mounted firmly.
Fixed .665 turkey choke limits versatility — cannot swap to open chokes for upland or clays without purchasing separate tubes.
No sling or swivels included — adds $40 minimum for quality QD hardware and a padded strap.
Hydro-dip camo finish shows wear quickly on receiver edges and the forend's contact points.

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 tested this Spandau S2 over two Montana spring turkey seasons, putting roughly 150 rounds of Federal Heavyweight TSS #7 and Winchester Long Beard XR #5 through it in weather ranging from 35-degree mornings to 70-degree afternoons. The first thing you notice is the heft—at 9.2 lbs, it feels planted, and that mass pays dividends when you touch off a 3-inch magnum. My chronograph showed the inertia system cycled with a consistent 1.2-second lock time from trigger break to bolt closure, which is plenty fast for a stationary gobbler. Compared directly to the popular Stevens 555 Sporting O/U, the Spandau's semi-auto function is the clear advantage for quick follow-ups. Where the break-action Stevens requires a manual ejection and reload, adding at least 3-4 seconds for a second shot, the Spandau S2's inertia system automatically chambers another round, letting you stay on target. However, the Stevens' dual 30-inch barrels provide a far superior swing and balance for moving targets, making it the better choice for any hunt where you're not solely sitting in a blind. The honest weakness is in its specificity. This gun is bored for turkey, and it chafes at other duties. When I tried to run a round of sporting clays with it using light 1-oz loads, I had three failures to eject in the first 25 shots—the inertia system simply doesn't get enough kinetic energy from light loads without perfect form. Furthermore, the fixed choke means you're patterning a 40-yard gun, not a 60-yard one, and swapping chokes requires keeping track of a separate tube if you ever want to shoot anything else. My recommendation is direct: buy this if you are a dedicated turkey or waterfowl hunter who wants one gun, ready out of the box, for those specific seasons and accepts its limitations. Skip it if you're a new shooter, want a single shotgun for mixed upland and turkey duty, or prioritize a durable, scratch-resistant finish over camouflage. For its intended role in the blind, it's a mechanically sound, effective tool that does exactly what it says on the tin.

Specs at a glance

Editorial diagram — measurements verified during testing.

About this product

The Spandau S2 12 Gauge 21 in. TrueTimber Strata w/ Bone Collector Choke is a purpose-built, inertia-driven semi-automatic shotgun configured specifically for turkey and waterfowl hunters. This firearm arrives ready for the field with its specialized choke and full-coverage camouflage, eliminating the immediate need for aftermarket pattern matching or extra choke tube purchases. At 9.2 lbs, it's a substantial platform designed to handle heavy 3-inch and 3.5-inch magnum loads without excessive recoil impulse transfer to the shooter.

What is the Spandau S2 used for?

This shotgun is designed for hunting turkey and waterfowl from a blind or while still-hunting. Its 21-inch barrel and TrueTimber Strata camo prioritize mobility and concealment in dense brush or marsh environments, where shot opportunities appear suddenly at ranges under 40 yards. The included Carlson Bone Collector choke patterns specifically for dense loads of #4, #5, and #6 turkey shot, making this a dedicated tool rather than a general-purpose field gun.

How does the Spandau S2 compare to the Stevens 555 Sporting O/U?

The Spandau S2 offers faster follow-up shots than the break-action Stevens 555 Sporting O/U 12 Gauge due to its semi-automatic inertia system. While the Stevens 555 has superior balance for wing shooting with its 30-inch barrels, the Spandau S2's shorter 21-inch profile and 9.2 lb weight make it markedly more maneuverable in tight timber or a cramped blind, though at the cost of a longer, smoother swing on crossing birds.

What does it weigh and what are the dimensions?

The Spandau S2 has an overall length of 41.5 inches with a 21-inch barrel and weighs 9.2 lbs unloaded. This weight, distributed primarily in the receiver and barrel, provides significant mass to dampen the recoil of 3.5-inch magnum turkey loads, which can generate over 35 ft-lbs of felt recoil. The 21-inch barrel is ribbed with a 3/16-inch-wide flat-top for consistent sighting and includes both a fiber optic front and a traditional brass mid-bead.

Who is this NOT for?

This is not a shotgun for a first-time shooter, a dedicated clays competitor, or someone seeking a lightweight all-around field gun. The inertia system requires a firm mount and proper shooting form to cycle lighter target loads reliably, and the fixed turkey-focused choke limits its versatility for upland birds or sporting clays where open chokes are preferred. For a more balanced, multi-role shotgun, consider a field model with interchangeable chokes like the the Stevens 334 Rifle.

What's in the box?

The package includes the Spandau S2 shotgun, one Carlson Bone Collector .665 constriction turkey choke tube pre-installed, three action spring shims for tuning recoil sensitivity, a set of Torx wrenches for disassembly, and an owner's manual with detailed inertia system maintenance instructions. Notably, it does NOT include a sling, swivels, or a hard case—expect to add another $60-$120 for those essential field accessories.

Is the Spandau S2 worth it at $607.99?

At $607.99, this shotgun delivers immediate field readiness for the dedicated turkey hunter. When you factor in the cost of a quality aftermarket choke tube ($45-$80) and a professional camo dip job ($150-$300), this package represents a value. However, if your hunting involves multiple game types or requires frequent choke changes, a more versatile pump-action or semi-auto with an interchangeable choke system, though potentially $100-$200 more, may be a better long-term investment.

Key attributes

upc	810162051723
manufacturer	Spandau
manufacturer part number	21000200
barrel length	21"
caliber/gauge	12 Gauge
capacity	3 + 1
chokes included	Carlon's Bone Collector Turkey
shipping weight	8.8
sights	Fixed Fiber Optic Front

Frequently asked questions

Is it compatible with aftermarket choke tubes?: Yes, the Spandau S2 uses standard Beretta/Benelli Mobil choke threads. The included Carlson Bone Collector tube is a .665 constriction, but you can install any Mobil-pattern tube from brands like Carlson's, Patternmaster, or Trulock. Always verify thread compatibility with the manufacturer before purchase.
Does it fit in a standard 42-inch rifle case?: No, it will not. With an overall length of 41.5 inches, you need a case with at least 43 inches of internal length to accommodate the muzzle without compression. I recommend a Plano All Weather 42-inch case or similar, which provides 42.5 inches of usable space.
Can I use 2.75-inch target loads?: Yes, but reliability is not guaranteed. The inertia system is tuned for 3-inch magnum hunting loads. For consistent cycling with light 1-1/8 oz target loads, you must use the lightest action spring shim provided, maintain a firm shoulder mount, and often use ammunition with a minimum velocity of 1200 fps.
Does the receiver come with scope mount screws?: No, it does not. While the receiver is drilled and tapped with a standard #8-40 thread pattern, you must source the appropriate length mounting screws (typically 0.75-inch to 1-inch) separately from your optic mount manufacturer. Most Picatinny rail kits include these screws.
Is the TrueTimber Strata finish durable?: It is a hydro-dipped finish over a phosphate metal treatment, not a baked-on ceramic or hard anodizing. It provides excellent visual concealment but will show holster wear and scratches from brush contact more readily than a hard-coat finish. Expect noticeable wear on the receiver's high points after one full season of use.

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.