The SIG Sauer P320 has become a ubiquitous handgun, adopted by the US military (as the M17 and M18) and favored by countless law enforcement agencies and civilians. But with so many variants, choosing the right one can be daunting. This comparison focuses on the key differences between the full-size M17 and the compact M18, helping you decide which best suits your needs.
Size and Weight: The Defining Difference
The most significant difference between the SIG P320 M17 and M18 lies in their size and weight. This impacts concealability, comfort, and overall handling.
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SIG P320 M17 (Full-Size): The M17 offers a larger grip, providing a more substantial and controlled shooting experience. Its longer barrel contributes to greater accuracy and velocity. However, its size makes concealed carry more challenging. The added weight can also lead to fatigue during extended shooting sessions.
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SIG P320 M18 (Compact): Designed for concealed carry, the M18 boasts a shorter barrel and grip, making it significantly more compact and easier to conceal. The reduced weight enhances maneuverability and reduces fatigue. However, this smaller size might compromise accuracy for some shooters and reduce the overall felt recoil mitigation.
Size Comparison Table:
| Feature | SIG P320 M17 | SIG P320 M18 |
|---|---|---|
| Barrel Length | 4.7 inches | 3.9 inches |
| Overall Length | 7.2 inches | 6.6 inches |
| Height | 5.5 inches | 5.5 inches |
| Width | 1.3 inches | 1.3 inches |
| Weight (empty) | ~28 ounces (~794 grams) | ~24 ounces (~680 grams) |
Capacity and Ammunition: A Subtle Variation
While both pistols generally use the same 9mm ammunition, the magazine capacity can differ slightly depending on the specific magazines used. You'll typically find higher capacity magazines available for the M17 due to the longer grip length. However, manufacturers produce extended magazines for the M18 to increase capacity. Always check the magazine's compatibility with your chosen pistol.
Ergonomics and Handling: Personal Preference Reigns Supreme
Both the M17 and M18 share the same ergonomic design elements that define the P320 platform. The modularity allows for customized grip sizes, enhancing the fit for different hand sizes. However, the size difference significantly impacts handling. The M17's larger grip might offer more stability and control for larger hands, while the M18's smaller size might be preferable for those with smaller hands or for concealed carry. Ultimately, the best fit will be determined by individual hand size and preference.
Concealability and Carry: A Clear Winner
The M18’s compact design makes it significantly easier to conceal than the M17. For everyday carry, especially under clothing, the M18 is a more practical option. The M17, while potentially more comfortable for range use, is less suitable for concealed carry for most individuals.
Conclusion: The Right Choice Depends on Your Needs
Choosing between the SIG P320 M17 and M18 depends entirely on your intended use. The M17 excels as a service pistol or for range shooting, offering better accuracy and control. The M18, with its superior concealability and lighter weight, is the ideal choice for concealed carry and personal defense situations where a compact pistol is preferred. Consider your priorities – accuracy, concealability, weight – and choose accordingly. Both handguns are reliable and feature-rich, making them excellent choices within the SIG P320 family.
