Best SIG P322 Accessories (2026): Optics, Lights & Suppressors

The best SIG P322 accessories of 2026 turn an already excellent rimfire into the most fun training gun in your safe. Out of the box, the P322 gives you a 4 inch threaded barrel, an optics-ready slide, a light rail, and 20-round magazines. Add a micro red dot, a compact light, and a .22 suppressor and you have a quiet, accurate trainer that mimics your carry gun for pennies a round.

Our reviewer put well over 1,500 rounds through his P322 without cleaning or oiling it and said he could not stop shooting it. His favorite configuration was a Romeo Zero red dot, a suppressor, and a flashlight, and that is exactly how we built this guide. Every pick links to a GunsAmerica Digest review, and prices are labeled at the time of review.

Before you spend a dime, learn to load the magazines correctly. Our reviewer showed how a round stacked wrong in the 20-round magazine will nosedive and cause a malfunction. Most rimfire problems are ammo or magazine problems.

Load the mags right, then build the P322 you want. It is a .22, so feeding it is cheap, and cheap reps are the whole point.

Buyer’s Guide: How To Choose The Best SIG P322 Accessories In 2026

Choosing the best SIG P322 accessories comes down to how you will use the gun: training, plinking, competition, or suppressed fun. Here is what matters.

Optic Footprint

The P322’s rear sight plate comes off for a micro red dot. Our launch review confirmed the footprint fits micro dots like the SIG Romeo Zero and Holosun 407K. Stick with optics sized for subcompact carry guns, and check screw length before you install.

Lights For A Rimfire

The P322 has an accessory rail, so a pistol light bolts right on. A compact light like the Streamlight TLR-7 X keeps the gun balanced and matches what many people run on carry guns. A full-size light like the TLR-1 HL adds more output and weight. Make sure any holster you buy fits the light you choose.

Suppressor Ready Out Of The Box

The P322 comes with a 1/2×28 thread adapter, so you can run a muzzle device or suppressor right away. Our reviewer noted the slide will not come off with the adapter installed, so remove it before takedown. A .22 suppressor makes the P322 hearing safe with many loads and wildly fun to shoot. Remember that suppressors are NFA items with paperwork and a wait.

Ammo Choice Matters

Our reviewer shot at least 20 rounds each of every brand of .22 LR he could find. He had two misfires, one with American Eagle and one with CCI Quiet 710 fps, which he blamed on rimfire ammo rather than the gun, and he found CCI Quiet would not run the slide. Standard and high-velocity loads are the safe bet.

Magazines

The P322 ships with two 20-round magazines and a loader, and SIG later offered 25-round magazines, which ship with the P322-COMP. Extra magazines are the cheapest accessory that makes range days more fun. Load them carefully so rounds do not stack on top of each other.

Trigger And Competition Upgrades

Our original guide recommended an adjustable aftermarket trigger, and SIG’s P322-COMP adds an adjustable trigger shoe and a two-port compensator from the factory. If you plan to shoot rimfire matches, a red dot and a comp make the biggest difference.

Best SIG P322 Accessories Ranked: 2026 Product Roundup

SIG Romeo Zero: Best Factory-Matched Red Dot (2026)

Our P322 launch reviewer’s favorite setup used a SIG Romeo Zero, and SIG ships the P322-COMP with the Romeo Zero Elite installed, so it is the natural first choice. Our P365XL reviewer found the Romeo Zero easy to install with four screws and said it integrates perfectly by design. It is rugged, has a 20,000-hour battery life, and comes with 3 or 6 MOA dots and eight daytime brightness settings.

Read our full SIG Romeo Zero review here.

The rear of the sight has a notch that lines up with the front sight for a backup sight picture. On the P322, our reviewer found his groups shrank to tiny, amazing-looking groups at 12 yards once he added the red dot. MSRP was $249 at the time of our P365XL review. The Elite version adds a steel protective shroud, which our original guide picked.

Key Specs

• Dot: 3 or 6 MOA
• Battery: CR1632, 20,000 hours
• Adjustment: 120 MOA windage and elevation
• Install: Four screws
• MSRP: $249 at time of review

Pros

• Matches the P322 cut
• Easy installation
• Long battery life
• Elite shrouded version available

Cons

• Polymer lens on the base model
• Tested on a P365XL, not a P322

🛒 Check Current Price for SIG Romeo Zero on GunsAmerica

Holosun 407K: Best Upgrade Red Dot (2026)

The Holosun 407K is another micro dot our P322 launch review confirmed fits the slide. Our 407K reviewer tested both the red and green versions on carry Glocks and found the green dot just as bright and easy to pick up as red, even against light Arizona desert backgrounds. He had been shooting red dots since the mid-1990s and saw no problem with either color.

Read our full Holosun 407K review here.

The 407K uses a CR1632 battery with a rated 50,000-hour life. MSRP was $258.81 for red and $276.46 for green at the time of the 2021 review. His original V2 units had large vertically stacked buttons that were later discontinued in favor of the X2 design with smaller horizontal buttons, so make sure you know which version you are buying.

Key Specs

• Colors: Red or green
• Battery: CR1632, 50,000 hours rated
• Versions: V2 (discontinued), X2
• MSRP: $258.81 red, $276.46 green at time of review

Pros

• Very long battery life
• Green dot as visible as red
• Fits the P322 footprint

Cons

• Pricier than the Romeo Zero
• Tested on Glocks, not a P322

🛒 Check Current Price for Holosun 407K on GunsAmerica

Streamlight TLR-7 X: Best Compact Weapon Light (2026)

A compact light is the right match for a P322 that doubles as a carry-gun trainer. The TLR-7 X is a multi-fuel light that runs on a rechargeable SL-B9 battery with a USB-C port or a standard CR123A. It puts out 500 lumens and 5,000 candela, and it weighs just 2.48 to 2.64 ounces.

Read our full Streamlight TLR-7 X review here.

Run time is listed at 1.5 hours with a CR123A or 1 hour on the rechargeable battery. It comes with interchangeable paddle switches, a multi-tool, and the SL-B9 battery. Our reviewer had thousands of rounds on other TLR-7 variants and was pleased with the X. It was priced between $140 and $157 at the time of review, depending on color and battery choice.

Key Specs

• Output: 500 lumens, 5,000 candela
• Battery: SL-B9 rechargeable or CR123A
• Weight: 2.48 to 2.64 oz
• Run Time: 1.5 hr (CR123A), 1 hr (SL-B9)
• Price: $140 to $157 at time of review

Pros

• Very light
• Rechargeable or CR123A
• Swappable switches
• Good value

Cons

• Less output than full-size lights
• Short run time on high

🛒 Check Current Price for Streamlight TLR-7 X on GunsAmerica

Streamlight TLR-1 HL: Best Full-Size Weapon Light (2026)

Our original guide picked the TLR-1, and the high-lumen version is a beast. Our reviewer said the TLR-1 HL puts out 1,000 lumens and 20,000 candela with a specified throw of 283 meters, and it scored well on all three of his criteria: durability, lumens, and size.

Read our full Streamlight TLR-1 HL review here.

It weighs 4.32 ounces and runs on CR123A lithium batteries. On a P322, a full-size light adds weight up front, which some shooters like for recoil and muzzle control, and it is the better choice if your P322 does double duty as a truck or camp gun. If you are matching a compact carry setup, pick the TLR-7 X instead.

Key Specs

• Output: 1,000 lumens, 20,000 candela
• Throw: 283 meters specified
• Weight: 4.32 oz
• Battery: CR123A

Pros

• Very bright
• Long throw
• Proven durability

Cons

• Bulkier and heavier than the TLR-7 X
• Disposable batteries

🛒 Check Current Price for Streamlight TLR-1 HL on GunsAmerica

Rugged Mustang22: Best Modular .22 Suppressor (2026)

Our reviewer gave the Mustang22 an A+ for its modularity. In the short configuration it measures only 3.4 inches long and weighs 2.4 ounces, and it still fully suppresses the report without adding much length. The long configuration weighs 3.3 ounces. On a rifle, he found the sound difference between long and short nearly unnoticeable.

Read our full Rugged Mustang22 review here.

The baffles and body are 7075 aluminum, and the serialized mount is grade 5 titanium with direct 1/2×28 threads, which fits the P322’s adapter. Rugged backs it with an unconditional lifetime warranty. MSRP was $465 at the time of the 2024 review, and he had seen it on sale for $365. His advice: you will likely own your suppressor for life, so buy the one you want the first time.

Key Specs

• Length: 3.4 inch short configuration
• Weight: 2.4 oz short, 3.3 oz long
• Materials: 7075 aluminum, titanium mount
• Thread: 1/2×28
• MSRP: $465 at time of review

Pros

• Very short and light
• Modular length
• Lifetime warranty

Cons

• NFA paperwork and wait
• Aluminum baffles need regular cleaning

🛒 Check Current Price for Rugged Mustang22 on GunsAmerica

OSS RAD22: Best Low-Maintenance .22 Suppressor (2026)

Rimfire suppressors get filthy, and OSS designed the RAD22 to stay cleaner. Its flow-through design vents carbon and lead out the muzzle end instead of trapping it inside, which our reviewer said keeps both the can and the gun cleaner and helps the gun cycle reliably. He found it tiny, cleanly finished with no visible tooling marks, and robust.

Read our full OSS RAD22 review here.

It is also full-auto rated for 5.7x28mm, which says a lot about its durability. He said it may be the best .22 LR suppressor on the market and would recommend it to anyone looking for one. MSRP was $449 at the time of the 2020 review.

Key Specs

• Design: Flow-through
• Rating: Full-auto 5.7x28mm
• Thread: 1/2×28 (rimfire)
• MSRP: $449 at time of review

Pros

• Stays cleaner than traditional cans
• Small and light
• Very durable rating

Cons

• NFA paperwork and wait
• 2020 review

🛒 Check Current Price for OSS RAD22 on GunsAmerica

Final Thoughts On The Best SIG P322 Accessories Of 2026

If you only buy one of the best SIG P322 accessories, make it a red dot. The SIG Romeo Zero is the factory match, and the Holosun 407K is the long-battery-life upgrade. Add a Streamlight TLR-7 X for a carry-trainer setup or a TLR-1 HL for maximum output. If you are ready for the NFA wait, the Rugged Mustang22 is the modular pick and the OSS RAD22 is the low-maintenance choice.

Then buy extra magazines, load them carefully, and shoot it a lot. For more rimfire pistols, see our best .22LR pistols guide. Find new and used SIG P322 pistols on GunsAmerica.com. Train hard, shoot straight, and stay dangerous.