U.S. Marine Corps Authorizes Red Dot Optics on M17/M18 Pistols for Combat Qualification.

The U.S. Marine Corps has authorized pistol-mounted red dot optics for Combat Pistol Program qualification under MARADMIN 104/26, allowing Marines to qualify using the unit-funded M17 ROMEO optic. The move signals a broader shift toward modern sidearm employment, improving speed, accuracy, and combat effectiveness in close-range engagements.

The U.S. Marine Corps has authorized pistol-mounted red dot optics for Combat Pistol Program qualification, a change that could materially improve how Marines acquire and engage close-range threats with their secondary weapon. The authority, issued in MARADMIN 104/26 as a change to the FY26 Combat Marksmanship Symposium guidance, specifically permits Marines to qualify with the unit-funded M17 Romeo red dot optic, NSN 1240-01-713-9795. That caveat is strategically important. The Corps has not made the optic a universal baseline issue, but it has moved pistol optics from the edge of local experimentation into the formal qualification system. For a service that treats qualification standards as a readiness benchmark, that is a meaningful institutional signal that handgun optics are now viewed as combat-relevant rather than optional range accessories.

Related News: U.S. Army Approves New ‘General Forces Configuration’ for M17/M18 Pistols.

The U.S. Marine Corps has authorized the use of M17 Romeo red dot optics for pistol qualification, signaling a shift toward modernized sidearm employment by improving target acquisition speed, accuracy, and combat effectiveness in close-range engagements (Picture source: U.S. DoW/ Sig Sauer).

The move sits inside a wider Marine marksmanship overhaul. MARADMIN 095/26 also authorized Glock pistols for qualification in units that are officially issued them for unique duty requirements, shifted certain courses of fire from annual events to Global Force Management deployment requirements, replaced more costly rifle qualification targets with the “Drill” target, and advanced new lethality metrics at the Schools of Infantry. That package is tied to the Marksmanship Campaign Plan signed in September 2024, which seeks measurable combat lethality through the S.P.E.A.R. model of Speed, Precision, Executive Control, Adaptability, and Risk Exposure. In practical terms, the optics decision is not a stand-alone gear change. It is part of a service effort to align training with combat function, especially for Marines who may have to transition rapidly from primary weapon to sidearm during close, sudden, high-stress engagements.

The authorization matters because the Marine Corps sidearm itself is already built for this step. The M18, fielded by the Corps to replace legacy pistols including the M9, M9A1, M45A1, and M007, is a compact 9mm, striker-fired member of the Modular Handgun System family. Marine Corps reporting and SIG Sauer product data describe a handgun with interchangeable grip sizing, an ambidextrous manual safety, an M1913 accessory rail, an optic-ready slide, a 3.9-inch barrel, a 28.1-ounce unloaded weight, and magazine options of 17 or 21 rounds. Despite the “M17” name, the authorized optic is designed specifically for both M17 and M18 military-issue pistols using the MHS interface. That means the Corps is not forcing a workaround onto an old handgun. It is finally leveraging a design feature already baked into the service pistol architecture.

SIG’s ROMEO-M17 is a fully enclosed, sealed, gas-purged reflex optic built in a 7075 aluminum housing with an integrated gas deflector, anti-reflection grooves, drainage channels, and an extremely low deck height that allows co-witness with standard-height iron sights. It uses a selectable 2 MOA dot and 32 MOA circle reticle, offers 15 brightness settings, including three for Gen 3+ night vision devices, runs on a side-mounted CR2032 battery, and is rated for up to 50,000 hours of runtime at medium brightness. Windage and elevation adjust in 1.5 MOA clicks. In performance terms, that configuration matters because a pistol optic changes the shooter’s visual problem: instead of aligning front sight, rear sight, and target across multiple focal planes, the Marine can stay target-focused and superimpose a single aiming reference on the threat. Under stress, in low light, from awkward positions, or when shooting one-handed, this can reduce visual workload and speed first-shot engagement while preserving precision at the outer edge of pistol distances.

The deeper significance is doctrinal and industrial at the same time. Recent Marine sustainment training in Okinawa described the Combat Pistol Program as ensuring Marines can use the M18 effectively from a variety of distances in combat situations, which is exactly where a modern enclosed red dot has value: rapid sight pickup, better hit probability during transitions, and a more resilient sighting system on a reciprocating slide exposed to blast residue, rain, dust, and hard daily carry. The unit-funded condition means adoption will probably be uneven because optics, batteries, holsters, maintenance habits, zeroing discipline, and instructor familiarity all impose real costs. But once qualification rules recognize the optic, the institutional barrier has been broken. The Marine Corps is signaling that the sidearm is no longer a legacy badge of issue. It is becoming a modern fighting subsystem that must be trained, measured, and eventually equipped to the same lethality logic now shaping the rest of the force.