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The ProMag SIG-A8 is a 17-round 9mm magazine engineered as a spare or replacement option for Sig Sauer P320 pistols. It gives you the standard P320 full-size capacity in blue steel construction that ProMag has been manufacturing since their early days in the magazine business.
This magazine body comes from heat-treated carbon steel with traditional stamping and welding methods. The injection-molded polymer follower works with a heat-treated chrome silicon wire spring to manage round stacking. The removable baseplate lets you access the interior for cleaning when needed. ProMag backs every one of these magazines with a lifetime guarantee against manufacturer defects, which is a real vote of confidence in their build quality.
The 17-round capacity matches the factory standard for full-size P320 models, and it's also compatible with P320 Carry and some other variants. The flush-fit design doesn't add extra grip length. It's worth noting that aftermarket magazines sometimes require a closer look at fit before relying on them for critical use – the P320 platform does have some variation in how magazines seat depending on the specific grip module version you're running.
ProMag manufactures this magazine domestically. It's blue steel, which gives it a classic look while still offering the protection of heat-treated construction. The design keeps things straightforward – no complicated feed geometry tricks or exotic materials, just traditional magazine engineering scaled up to 17 rounds.
The capacity and general dimensions match factory P320 mags, but aftermarket magazines sometimes have slightly different tolerances. You should test it with your specific P320 to make sure it seats and functions the way you want before relying on it. The P320's modular design means different grip modules can affect how magazines fit.
The main difference is price point and brand heritage. Factory Sig magazines come with Sig's quality assurance behind them. This ProMag offers the same basic 17-round capacity and heat-treated steel construction at a lower cost, along with ProMag's lifetime warranty. Whether the tradeoff makes sense depends on your use case and budget.
The 17-round capacity is the standard for full-size P320 models like the Full, Carry, and M17. Compact P320s typically run 15 rounds, and subcompacts hold even fewer. Check your specific P320 variant to make sure a 17-rounder fits your needs.
ProMag uses heat-treated chrome silicon wire springs designed to resist fatigue over years of use. The lifetime warranty covers defects, but like any magazine, spring tension can change with heavy use over time. Rotating magazines in and out of service helps extend their lifespan.
| UPC | 708279013331 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SIG-A8 |
| Brand Fit | Sig Sauer |
| Caliber/Gauge | 9mm |
| Capacity | 17 |
| Color | Blue |
| Length | 5 |
| Model | |
| Model Fit | Sig P320 |
| Package Height | 1.3 |
| Package Width | 4.6 |
| Product Type | Accessory-Magazines |
| Quantity | 1 |
| Shipping Weight | 0.2 |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (OR) | NO SALE TO OREGON |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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