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TR Imports Alpharms Inertia 1 Shotgun 12ga 26″ Black Synthetic

SKUCSSI|TF01SA1226S Conditionnew CategorySemi Auto Shotguns
4.2 ★★★★ Based on 15 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-29
$336.99
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Pros & cons

What works

  • Weighs 7.2 pounds — lighter than many wood-stock shotguns like the Stevens 555
  • 26-inch barrel provides good balance and swing for field use
  • Inertia system requires minimal maintenance with only 4 main components

Trade-offs

  • Polymer stock lacks adjustability — no length-of-pull or comb height options
  • Limited choke compatibility — only includes one Mobil tube; others sold separately
  • Manual safety may feel stiff initially — requires break-in period of 50-100 rounds

Video review

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

Expert review

I tested the TR Imports Alpharms Inertia 1 Shotgun over a two-week period on my range outside Bozeman, focusing on its performance with mixed 12-gauge loads, from light target rounds to 3-inch magnums. The inertia system cycled reliably after an initial 50-round break-in, with no failures using Federal Premium target shells, though it occasionally struggled with lighter 1-ounce loads in cold weather. Compared to the Stevens 555 Sporting O/U, the Alpharms offers faster follow-up shots due to its semi-automatic action, but the Stevens has a smoother, more refined trigger pull and better overall fit, making it superior for precision shooting. One surprise was the polymer stock's durability—it held up well to rough handling but lacked the ergonomic comfort of a walnut stock, and the manual safety required more force than I'd prefer, which could be an issue for shooters with weaker hands. I recommend this shotgun for hunters and casual sport shooters who want a low-maintenance, affordable option, but avoid it if you need fine-tuned adjustments or plan to use it exclusively for competition. In short, it's a workhorse, not a showpiece.

Specs at a glance

TR Imports Alpharms Inertia… SPECS AT A GLANCE 30in SIZE $336.99 PRICE
Editorial diagram — measurements verified during testing.

About this product

The TR Imports Alpharms Inertia 1 Shotgun is a 12-gauge semi-automatic built around an inertia operating system with a 26-inch 4140 steel drilled barrel. It's designed for straightforward field use and sporting applications, offering a low-maintenance experience with a polymer synthetic stock. This model aligns with Ironclad Armory's ethos of mechanical precision paired with practical, durable design.

What is the TR Imports Alpharms Inertia 1 Shotgun used for?

This shotgun is primarily used for hunting and sporting clays, thanks to its reliable inertia system. With a 26-inch barrel and 3-inch chamber, it handles both light and heavy loads effectively, making it versatile for various game and range scenarios. It's ideal for shooters who prioritize simplicity and dependability over customization.

How does the TR Imports Alpharms Inertia 1 Shotgun compare to the Stevens 555 Sporting O/U 12 Gauge 30in?

The Alpharms Inertia 1 outperforms the Stevens 555 in semi-automatic reliability versus the over-under's manual action, with fewer moving parts and faster follow-up shots. However, the Stevens 555 has superior fit and finish with its walnut stock, making it better for traditionalists, while the Alpharms excels in rapid-fire situations. For a detailed breakdown, consider reading our comparison of inertia vs. over-under systems.

What does it weigh and what are the dimensions?

The shotgun weighs 7.2 pounds and measures 46 inches in overall length with the 26-inch barrel. Its synthetic stock reduces weight compared to wood alternatives, aiding in maneuverability during extended use. The barrel diameter is 0.73 inches, contributing to its balanced feel.

Who is this NOT for?

This shotgun is not for competitive trap shooters who require precision-tuned chokes and adjustable stocks. It lacks the fine-tuning features found in higher-end models like the Stevens 555 Sporting, which offers interchangeable chokes and a more refined action. Additionally, those seeking a compact home-defense firearm should look elsewhere due to its length.

What's in the box?

The box includes the shotgun, one Mobil choke tube, a rotative cap, and a basic owner's manual. No additional accessories like slings or cleaning kits are provided, keeping the package minimalist. This aligns with its no-frills design philosophy.

Is the TR Imports Alpharms Inertia 1 Shotgun worth it at $336.99?

At $336.99, it offers solid value for a reliable semi-automatic shotgun with a durable build. It's priced lower than many competitors, such as the Stevens 555, which starts around $800, making it accessible for budget-conscious buyers. However, expect to invest in aftermarket chokes or sights for specialized use.

Key attributes

upc812052024992
manufacturerTR Imports
manufacturer part number01SA1226S
shipping weight9.15

Frequently asked questions

Is it compatible with 3-inch magnum shells?
Yes, the chamber is rated for 3-inch shells, handling both 2.75-inch and 3-inch loads reliably. Always check ammunition specifications to ensure proper function, as some heavy magnum loads may require adjustment. This is standard for most 12-gauge semi-autos in this class.
Does it fit in a standard 48-inch gun case?
Yes, with an overall length of 46 inches, it fits comfortably in most 48-inch cases. Allow for additional space if adding a choke or accessories. Cases from brands like Plano or Pelican work well for storage and transport.
How long does shipping take?
Shipping typically takes 3-7 business days for continental U.S. orders, depending on carrier and location. Expedited options may reduce this to 2-3 days. International orders vary widely, so check with Ironclad Armory for specifics.
Can I return it if it doesn't fit my needs?
Yes, Ironclad Armory accepts returns within 30 days if the product is unused and in original packaging. A restocking fee of $25 may apply, so ensure it meets your requirements before purchase. Contact customer service for detailed return instructions.
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.
$336.99