SIG M17 vs M18: Complete 2026 Comparison — Specs, Military History & Which to Buy

SIG M17 vs M18: The Three-Second Answer to the Military’s Two-Brother Pistols

Short answer: The M17 is the full-size version (4.7" barrel, 8.0" overall length, 29.6 oz empty), while the M18 is the compact version (3.9" barrel, 7.2" overall length, 28.1 oz empty). Both pistols share the same Fire Control Unit (FCU), and 17-round standard magazines are fully interchangeable, as are the 21-round extended magazines. The U.S. Army fields the M17 as its primary sidearm; the Marine Corps chose the M18. In the airsoft world, VFC offers licensed 1:1 GBB replicas of both.

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Is the SIG P320 Worth Buying in 2026? All 7 Models Ranked

SIG P320: The Pistol That Won a Military Contract and Then Divided the Shooting World

Short answer: yes, but it depends on what you’re doing with it. The P320 remains a top-tier modular pistol for IPSC/USPSA and range training — the U.S. Army still carries it, and the X-Five Legion is one of the best competition pistols money can buy. But 100+ active lawsuits, a full IDPA ban, and a growing list of police departments pulling it from duty mean your buying decision in 2026 isn’t as simple as it was in 2020. Below we rank all 7 models, break down the safety controversy with the latest legal developments, and tell you exactly which variant fits competition, carry, or collection.