Sig Sauer P322

The Sig Sauer P322 is one of the standout .22 LR pistols of the past several years — a full-size .22 rimfire pistol with 20+1 capacity, optic-ready slide cut, and a threaded barrel ready for suppressors. Sig designed the P322 from the ground up as a serious .22 LR pistol (not a converted centerfire design), and the result is a rimfire that’s genuinely fun to shoot at a price that justifies high-volume range use. Impact Guns carries the Sig Sauer P322.

Read our full Sig Sauer P322 Buying Guide ↓

20+1 in .22 LR — Why That Matters

The P322’s 20+1 capacity is the standout spec. Most .22 LR pistols carry 10 rounds; some compact models carry less. The P322’s 20-round magazine doubles typical capacity and dramatically improves the practical range experience — shooters spend more time shooting and less time reloading. For training applications where building round count matters more than perfect realism (the P322 doesn’t exactly mirror any specific centerfire pistol), 20+1 capacity stretches range trips significantly. The magazine is sized like a typical 9mm magazine, which makes the P322 feel like a full-size pistol throughout the firing cycle.

Optic-Ready and Suppressor-Ready

The P322 slide ships with an optic cut for the Romeo Zero / Shield RMSc footprint — install a compact red dot directly without a plate adapter. The barrel ships threaded (1/2-28) for direct suppressor or compensator mounting. Both features are standard, not premium upgrades, which makes the P322 unusually feature-rich at its price tier. A suppressed P322 is one of the quietest practical firearms available — .22 LR with a suppressor is action-movie quiet, and the P322’s capacity makes extended suppressed range sessions practical.

Performance with .22 LR Ammunition

.22 LR pistols are notoriously ammunition-sensitive. The P322 runs better than most with a wider ammunition tolerance than typical rimfire pistols, but quality ammunition still matters — CCI Mini-Mag, Federal Auto Match, and similar standard-velocity loads run reliably; the cheapest bulk ammunition may produce occasional malfunctions. For high-volume practice, finding a load your specific P322 prefers and buying in bulk is the standard practice. The pistol is forgiving but not immune to the rimfire ammunition sensitivity that affects all .22 LR semi-autos.

What the P322 Is Built For

The P322 fills several roles: a fun-to-shoot range gun where ammunition cost matters; a training tool for centerfire shooters who want to build trigger discipline and recoil management at .22 LR costs; an introduction-to-shooting pistol for new shooters who benefit from the low recoil and high capacity; a suppressor host for shooters with quiet .22 LR cans. It’s not a defensive pistol — .22 LR terminal performance is too marginal — but for nearly every other handgun use case, the P322 is a credible option.

Frequently Asked Questions

Is the Sig P322 reliable?
With quality ammunition, yes — the P322 has earned a strong reliability reputation by .22 LR pistol standards. All .22 LR semi-autos are more ammunition-sensitive than centerfire pistols; the P322 tolerates a wider ammunition range than most but still benefits from quality loads. CCI Mini-Mag is the consensus recommendation for reliable function.

What red dot fits the Sig P322?
The P322 slide is cut for the Romeo Zero / Shield RMSc footprint — the Sig Romeo Zero, Shield RMSc, Holosun 407K/507K, and similar compact red dots fit directly. This is the dominant compact pistol red dot footprint, so red dot options are broad.

Can I suppress the Sig P322?
Yes — the P322 ships with a 1/2-28 threaded barrel for direct suppressor mounting. Any .22 LR-rated suppressor with 1/2-28 threading attaches directly. The P322 is one of the most popular .22 LR suppressor hosts because of the threaded barrel and high capacity combination.