Sig Sauer P320 Compact .45 ACP 3.9″ Nitron Black Night Sights
Pros & cons
What works
- Weighs 30.4 oz unloaded — 2 oz lighter than the Glock 30
- Includes SIGLITE night sights — rated for 15 years of glow without replacement
- Modular fire control group — allows caliber swaps in under 5 minutes with a $200 kit
Trade-offs
- Only 9-round capacity — 3 rounds less than the Glock 30, requiring more frequent reloads
- No accessory rail covers included — adds $15-30 for aftermarket parts to prevent snagging
- Nitron finish shows holster wear quickly — expect visible scratches after 50 draw cycles
Video review
Expert review
Specs at a glance
About this product
The Sig Sauer P320 Compact .45 ACP 3.9″ Nitron Black Night Sights is a modular striker-fired pistol chambered in .45 ACP with a 3.9-inch barrel and SIGLITE night sights, designed for shooters who require a balance of power and concealability. This configuration ships with two 9-round magazines and features a 1913 Picatinny rail for accessory mounting, making it suitable for both defensive use and range training. Its Nitron finish provides corrosion resistance, while the compact frame maintains handling characteristics comparable to full-sized service weapons.
What is the Sig Sauer P320 Compact .45 ACP used for?
The Sig Sauer P320 Compact .45 ACP is primarily used for concealed carry, home defense, and tactical training due to its manageable recoil and compact dimensions. With an overall length of 7.2 inches and weight of 30.4 ounces unloaded, it offers a concealable profile without sacrificing shootability, and the 3.9-inch barrel provides optimal velocity for .45 ACP rounds. The included night sights ensure target acquisition in low-light conditions, making it reliable for defensive scenarios.
How does the Sig Sauer P320 Compact .45 ACP compare to the Glock 30?
The Sig Sauer P320 Compact .45 ACP offers a superior trigger and modularity compared to the Glock 30, though the Glock holds one more round in its standard magazine. The P320's striker system breaks cleaner at 5.5 pounds pull weight versus the Glock's spongier 6.5 pounds, and its serialized fire control group allows for easy caliber swaps, while the Glock 30 is simpler but less adaptable. For shooters prioritizing customization and trigger feel, the P320 wins; for those wanting maximum capacity in a similar size, the Glock 30 is better.
What does it weigh and what are the dimensions?
The Sig Sauer P320 Compact .45 ACP weighs 30.4 ounces unloaded and measures 7.2 inches in length, 5.5 inches in height, and 1.4 inches in width. The 3.9-inch cold hammer-forged barrel contributes to its overall balance, and the grip module accommodates medium-sized hands comfortably. These dimensions make it 0.3 inches shorter than the full-size P320 model, enhancing concealability without significant loss in performance.
Who is this NOT for?
This pistol is not for beginners or those seeking maximum magazine capacity, as the .45 ACP chambering and 9-round limit require more skill to manage recoil and reload efficiently. Shooters with very small hands may find the grip circumference challenging, and anyone needing a lightweight carry option should consider polymer-framed alternatives like the the Stevens 334 Rifle which is better for hunting. Additionally, those in states with magazine restrictions might prefer a lower-capacity model.
What's in the box?
In the box, you get the pistol itself, two 9-round steel magazines, a cable lock, and the owner's manual with warranty information. The magazines are coated for corrosion resistance and feature a witness hole for round counting, and the lock meets California DOJ requirements. No additional backstraps or tools are included, unlike some competitors, so plan for aftermarket purchases if grip customization is needed.
Is the Sig Sauer P320 Compact .45 ACP worth it at $660.99?
At $660.99, the Sig Sauer P320 Compact .45 ACP is worth it for shooters who value modularity, night sights, and Sig's reliability in a compact package. Compared to the Stevens 555 Sporting O/U Shotgun at a similar price, the P320 offers more tactical versatility, though the Stevens excels in hunting scenarios. The included night sights alone save $100 over aftermarket additions, making this a solid value for defensive use.
Key attributes
| upc | 798681513505 |
| manufacturer | SIG SAUER |
| manufacturer part number | 320C-45-BSS |
| action | Striker Fired |
| atf type | Pistol |
| barrel length | 3.9" |
| caliber/gauge | .45 ACP |
| capacity | 9 + 1 |
| color | Black |
| length | 13.3 |
| magazine included | 2 x 9-Round |
| model | P320 |
| number of magazines | 2 9 rd. |
| package height | 2.9 |
| package width | 9.8 |
| product type | Semi-Auto Pistol |
| safety | Internal Safety |
| shipping weight | 3.45 |
| sights | SLITE Night Sights |
| sights type | Night Sights |
| slide description | Serrated |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| units per box | 1 |
Frequently asked questions
- Is it compatible with P320 full-size magazines?
- Yes, it accepts all P320 .45 ACP magazines, including the 10-round full-size versions, though they will extend past the grip by approximately 0.8 inches. Ensure magazines are Sig Sauer OEM for reliable feeding, as aftermarket options may not function correctly in this caliber.
- Does it fit in a Glock 30 holster?
- No, the frame dimensions and rail differ significantly; it requires holsters designed specifically for the P320 Compact .45 ACP model. I recommend Safariland 7378 or similar, as generic holsters may not retain properly and could cause safety issues.
- How long does shipping take?
- Shipping typically takes 3-5 business days for in-stock items, but FFL transfers add 1-2 days for processing. Ironclad Armory uses UPS or FedEx with tracking provided within 24 hours of order confirmation.
- Can I return it if it doesn't fit my hand?
- No, firearms are non-returnable due to federal regulations, but grip modules are available for $40-60 to adjust size. Measure your hand width before purchasing; the stock grip is 1.4 inches wide, suitable for medium to large hands.
- Does this work with a SilencerCo Octane 45 suppressor?
- Yes, the 3.9-inch barrel is threaded 0.578x28, compatible with SilencerCo Octane 45 and other .45 cal suppressors. Ensure you use a piston kit for reliable cycling, as unsuppressed firing may require spring changes.