The SIG Sauer M400-Sentry 223 Rem / 5.56 NATO is a rifle from SIG Sauer. This configuration is built around Semi-Auto, a 16-inch barrel, and a listed capacity of 30 + 1.

The action is Semi-Auto. Barrel length is 16 inches. Capacity is listed as 30 + 1, meaning a 30-round magazine with one round in the chamber.

The finish is black fnc nitride. The grip specification is Magpul MOE-SL Stock. The magazine specification is one 30-round magazine.

Listed features are a romeo5 gen ii compact sight, a foxtrot-msr full size, and a 2-stage match trigger. The safety specification is ambidextrous safety selector. Overall length is 36.5 inches, and weight is 8 lbs.

The rate of twist is 1-in-7". This configuration is in the SIGM400 Series, and the manufacturer model number is RM400-SDI-16B-R5FX. Because this listing is a firearm, Send It Guns completes the sale through a licensed dealer transfer.

The UPC for this exact configuration is 798681716128. The store SKU is SIRM400SDI16R5F. Use 16 inches when you compare size with other SIG Sauer rifles, because barrel length is one of the fields that changes between similar model numbers.

The plus-one capacity figure is a magazine count plus a chambered round, which is different from a listing that quotes the magazine alone. The black fnc nitride finish is the surface treatment to match if you are comparing color or coating with another SIG Sauer configuration of the same model. The model name to compare is M400-Sentry. A close SIG Sauer model can differ in finish, capacity, barrel, sights, or included parts, and those differences are the reason this page stays with this configuration.

The caliber to match is 223 Rem | 5.56 NATO. The same model name in another caliber is a different firearm. Additional information on this page repeats the published specification list for this exact configuration. If a measurement is not in that list, it is not stated here and should not be assumed.

Compare the SIG Sauer M400-Sentry 223 Rem / 5.56 NATO with more Rifles, or browse the full Send It Guns catalog. See the official SIG Sauer site.