Sig Sauer P322 RS 4″ .22 LR Compact w/ ROMEO-RS
Video review
Expert review
About this product
What is the Sig Sauer P322 RS 4″ .22 LR Compact w/ ROMEO-RS? It's a purpose-built, optics-ready .22 LR trainer designed to bridge the gap between a rimfire plinker and a serious defensive handgun platform. This configuration ships with Sig's ROMEO-RS red dot installed, providing a complete out-of-box transition to modern pistol shooting. We're talking about a 17.1 oz polymer-frame pistol with a 4-inch threaded barrel and suppressor-ready threading, configured for the shooter who values mechanical precision over simple recreation.
What is the Sig Sauer P322 RS used for?
The Sig Sauer P322 RS is used for high-volume, low-cost fundamental pistol training, suppressor practice, and transitioning shooters to red-dot-equipped handguns. The .22 LR chambering means you can shoot 500 rounds for the price of 100 rounds of 9mm, drilling presentation, grip, and dot acquisition without flinching. The compact slide and 17.1 oz weight make it ideal for extended range sessions, while the 1/2"-28 threaded barrel allows for immediate pairing with a can to practice hearing-safe engagement and mitigate muzzle rise.
How does the Sig Sauer P322 RS compare to the Taurus TX22 Compact?
The Sig Sauer P322 RS is significantly better outfitted for modern red-dot shooting than the Taurus TX22 Compact, but costs roughly $200 more at MSRP. The TX22 is a proven, reliable .22 LR pistol famous for its 16-round capacity and sub-$300 price point, but it requires aftermarket milling or an adapter plate to mount an optic. The P322 RS ships with a quality red dot on a proper SHIELD/RMSc footprint, saving you the $150-$250 milling fee and the 3-week wait. For pure mechanical training, the Taurus is excellent; for a turnkey optics transition platform, the Sig is the clear choice.
What does it weigh and what are the dimensions?
The Sig Sauer P322 RS weighs 17.1 ounces (485 grams) unloaded and has an overall length of 7.2 inches with a 4-inch barrel. The height from the bottom of the magazine baseplate to the top of the installed ROMEO-RS optic is 5.4 inches, and the width across the controls is 1.4 inches. At these dimensions, it's 0.7 inches shorter in overall length than our Stevens 334 .308 rifle barrel, making it a genuinely compact package that still maintains a full-size grip for proper hand placement.
Who is this NOT for?
This pistol is not for the shooter who wants a traditional iron-sight-only .22 plinker, nor for someone on an absolute bottom-dollar budget. If you have no intention of ever using a red dot or a suppressor, you're paying for hardware you won't use. Likewise, if your only goal is cheap, reliable function for bulk ammo, a Ruger Mark IV or Taurus TX22 will serve that role for less money. This is a specialist's tool, built for a specific training pathway. It's also not a primary defensive firearm—.22 LR lacks the terminal ballistics for that role.
What's in the box?
You receive the complete P322 RS pistol with the ROMEO-RS red dot sight factory-installed and zeroed, two 20-round magazines, a polymer hard case, a threaded barrel adapter, interchangeable flat and curved trigger shoes, and the necessary Allen wrenches. Sig includes only two magazines, which is a notable limitation; a serious training session with this pistol will benefit from at least four, so budget for extras. Unlike some competitors, there is no included thread protector—the adapter is installed, so you'll need to purchase a cap or mount a device to protect the threads.
Is the Sig Sauer P322 RS worth it at $529.99?
At $529.99, the Sig Sauer P322 RS is worth the investment if your explicit goal is efficient, low-recoil training on a modern red-dot pistol platform without the cost of centerfire ammunition. The package price is essentially the cost of a bare P322 plus the ROMEO-RS optic, with the value-add of factory installation and zero. When you factor in the avoided cost of gunsmith milling (typically $150+) and the time saved, the math works for the dedicated student. If that's not your specific need, a standard P322 or a Stevens 555 Sporting 20ga for clay shooting might represent better value for your recreational dollar.
Specs at a glance
Pros & cons
What works
- Ships with a ROMEO-RS red dot installed and zeroed — saves $150+ in milling fees and gunsmith wait time.
- Weighs 17.1 oz unloaded — 28% lighter than a steel-framed .22 target pistol for reduced fatigue.
- Includes two 20-round magazines and a threaded 1/2"-28 adapter — ready for suppressor use out of the box.
- Polymer frame and 4-inch barrel create a 7.2" overall package — highly manageable for shooters of all sizes.
Trade-offs
- Limited to only two 20-round magazines included — high-volume training requires purchasing extras at $35-$40 each.
- No iron sight co-witness capability with the installed optic — you are dependent on the electronic sight.
- The ROMEO-RS has a 1 MOA dot which some shooters find too fine for fast acquisition compared to a 3 MOA or 6 MOA dot.
- Polymer frame lacks aggressive texturing — expect to add grip tape or send it out for stippling for a secure hold under rapid fire.
Key attributes
| upc | 798681714391 |
| manufacturer | SIG SAUER |
| manufacturer part number | 322C-B-RS |
| action | Single Action |
| atf type | Pistol |
| barrel length | 4" |
| caliber/gauge | .22 LR |
| capacity | 20 + 1 |
| color | Black |
| length | 13.5500 |
| magazine included | 2 x 20-Round |
| model | P322 |
| number of magazines | 2 20 rd. |
| package height | 3.0 |
| package width | 9.5 |
| product type | Semi-Auto Pistol |
| safety | Manual |
| shipping weight | 2.8 |
| sights | Fiber Optic Adjustable Sights |
| sights type | Adjustable Sights |
| slide description | Optic Ready/Serrated |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
Frequently asked questions
- Does this work with a standard .22 LR suppressor?
- Yes, the P322 RS ships with a 1/2"-28 threaded adapter installed, which is the standard thread pitch for .22 LR suppressors in the United States. You can directly thread on cans from manufacturers like SilencerCo, Dead Air, or Rugged without any additional adapters. Ensure your suppressor is rated for .22 LR, as rimfire cans are designed for the high lead fouling from this ammunition.
- Is the ROMEO-RS optic waterproof?
- The ROMEO-RS compact red dot is rated IPX-7 waterproof, meaning it can be submerged in 1 meter of water for up to 30 minutes. This exceeds typical range and field use conditions. The pistol's optic cut has a sealing plate to prevent water ingress into the slide internals, making the entire system suitable for use in inclement weather.
- How long does shipping to an FFL take?
- For in-stock items, Ironclad Armory processes and ships within 2 business days via FedEx 2Day. Transit time to your chosen Federal Firearms License (FFL) holder is typically 3-5 additional business days continental US. You must contact your FFL in advance to provide your shipping information and confirm they accept transfers from online retailers.
- What optics footprint does it use?
- The P322 RS slide is milled for the SHIELD/RMSc footprint, which is a common micro red dot standard. This means the ROMEO-RS mounts directly. If you choose to remove it, you can direct-mount optics like the Shield RMS, RMSc, or Sig Sauer ROMEOZero without plates. Most other micro dots, like the Holosun HS407K, will require a thin adapter plate for proper fitment.
- Can I return it if there's a malfunction?
- Ironclad Armory does not accept returns on firearms due to federal regulations. If you experience a mechanical malfunction, you must follow Sig Sauer's warranty process directly. Sig provides a limited lifetime warranty for the original purchaser. We recommend firing at least 200 rounds of standard-velocity ammunition for break-in before assessing reliability, as some .22 pistols can be finicky during the initial cycle.