The SIG Sauer P320 has become a ubiquitous handgun, adopted by the US military (as the M17 and M18) and numerous law enforcement agencies. Understanding the nuances between the M17 and M18 models is crucial for anyone considering purchasing either for personal defense, competition, or collection. This in-depth comparison will delve into the key differences, highlighting the strengths and weaknesses of each pistol.
Key Differences: M17 vs M18
The core distinction between the SIG Sauer P320 M17 and M18 lies in size and intended use. The M17 is a full-size service pistol, while the M18 is a compact variant. This fundamental difference influences nearly every aspect of their design and handling characteristics.
Size and Weight
| Feature | P320 M17 | P320 M18 |
|---|---|---|
| Barrel Length | 4.7 inches | 3.9 inches |
| Overall Length | 7.2 inches | 6.6 inches |
| Weight (unloaded) | Approximately 30 ounces | Approximately 26 ounces |
As the table illustrates, the M18 is significantly smaller and lighter than the M17. This reduction in size makes the M18 more concealable and easier to carry for concealed carry, while the M17 provides a more stable shooting platform.
Capacity
Magazine capacity is another significant difference. While both pistols utilize the same type of magazine, the actual capacity varies due to the differing grip sizes. The M17 typically holds 17 rounds (depending on magazine type and state laws), whereas the M18 typically accommodates 15 rounds. Extended magazines can increase capacity in both models, but this impacts the overall size and concealability of the M18.
Ergonomics and Handling
The reduced size of the M18 impacts ergonomics. While both pistols are generally comfortable to hold, the M17 offers a longer grip, providing a more substantial feel and better control during rapid fire. The M18's shorter grip is more suitable for smaller hands, but some shooters might find it less comfortable for extended shooting sessions. Many shooters find the M17's slightly larger grip better suited for more consistent shooting and follow-up shots.
Sights
Both the M17 and M18 typically come equipped with night sights. However, specific sight configurations can vary depending on the manufacturer and any customizations made. The sight picture remains consistent across both models, though the shorter sight radius on the M18 might make precise target acquisition slightly more challenging at longer ranges. This difference is subtle and mostly noticeable for experienced shooters.
Performance and Accuracy
Both the M17 and M18 utilize the same trigger mechanism and share a similar accuracy potential. However, the M17's longer barrel and sight radius typically translates to marginally better accuracy at longer ranges. The difference is generally minor and may not be noticeable for most users in self-defense scenarios. The longer sight radius gives you a more clear sight picture.
Reliability
Both pistols are known for their reliability and robustness. SIG Sauer utilizes a drop-safe, striker-fired design, and both the M17 and M18 have proven highly reliable in various testing environments. In normal use, both are unlikely to experience malfunctions.
Choosing Between the M17 and M18: A Practical Guide
The decision between the P320 M17 and M18 largely depends on individual needs and preferences.
Choose the M17 if:
- You prioritize maximum accuracy and a more stable shooting platform.
- You need a higher capacity magazine.
- You prefer a larger, more substantial grip.
- Concealability isn't a primary concern.
Choose the M18 if:
- Concealability and ease of carry are essential.
- You have smaller hands and prefer a more compact pistol.
- Weight is a significant factor.
- You need a pistol that's easy to maneuver in tighter spaces.
Ultimately, the "best" choice depends entirely on the individual shooter and their intended purpose. Consider renting or borrowing both models to determine which feels more comfortable and performs better for you. Handling and familiarity are crucial factors in choosing the right handgun for self-defense or competitive shooting.