Marines Green Light Optics for Pistol Qualifications

M17 Romeo on an M17 MHS pistol

The Romeo M17 sight (NSN: 1240-01-713-9795), seen attached to an M17 MHS handgun, is a mil-spec, fully enclosed and gas-purged red dot reflex sight with a distortion-free glass aspheric lens. It is submersible to depths up to 35 meters. (Photo: Chris Eger/Guns.com)

The nation’s 911 force is now officially authorizing pistol quals with a red dot optic, provided it is one very specific system.

On March 13, Marine Administrative Message (MARADMINS) 104/26 updated that the service’s Marksmanship Program will include the paragraph, “Marines are authorized to use unit funded Using Unit Responsibility Item, M17 Romeo red dot optic, National Stock Number 1240-01-713-9795 for Combat Pistol Program (CPP) qualifications.”

In short, so long as the SIG M17 Romeo sight is used – which was designed specifically for the P320-based M17 and M18 9mm Modular Handgun System – and it is bought with unit funds, the country’s premier amphibious warfare force can run red dots in qualifications.

Completely U.S. made and constructed of forged 7075 aluminum with a beryllium copper flexure arm (more on that in a minute) the Romeo M17 has an extremely low deck height so that armorers can reuse standard iron sights, has 15 illumination settings (including three for use with Gen 3+ night vision), beats drop and submersion tests, and, importantly, has an integral loaded chamber gas deflector shield that keeps the MHS from gassing up the lens after 10-15 rounds.

SIG Sauer M17 MHS pistol with Romeo M17 MRD sight
The Romeo M17 is a hoss. This installed example we saw dropped from 10 feet onto concrete at SIG’s plant in Oregon earlier this year with nothing but cosmetic damage to the housing. SIG explained to Guns.com that the Romeo M17 has surpassed 100,000 rounds in testing without loss of zero or parts breakage.  (Photo: Chris Eger/Guns.com)
SIG Sauer Romeo M17 MRD sight flexure arm
That magical Romeo M17 flexure arm. (Photo: Chris Eger/Guns.com)
SIG Sauer Romeo M17 MRD sight flexure arm
Installed near the base of the Romeo M17, the arm provides a backbone – so to speak – for the sight, cutting down on the number of parts that can fail. That, combined with the unique mounting process used on the sight that gives it six points of contact with the pistol host, makes it so tough. (Photo: Chris Eger/Guns.com)

Marines deployed with the Fleet have already been seen with red dot-equipped M17 Romeo-equipped M18s and Surefire X300 white lights.

M17 Romeo on an M18 MHS pistol
A U.S. Marine with Maritime Special Purpose Force, 22nd Marine Expeditionary Unit (Special Operations Capable), fires an M18 pistol during a qualification range aboard San Antonio-class amphibious transport dock USS Fort Lauderdale (LPD 28), while underway in the Caribbean Sea, Feb. 22, 2026. (U.S. Marine Corps photo)
M17 Romeo on an M18 MHS pistol
An inset of the above image, clearly showing the M17 Romeo on an M18 MHS pistol. (U.S. Marine Corps photo)

The Marines adopted the M18 in 2019, ordering 35,000 of the SIGs to not only replace legacy Beretta M9s but also the Colt M45A1 CQB .45ACP railgun and the M007 Glock.

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