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Tombstone Tactical Blog
Tombstone Tactical

800-606-0370

Tombstone Tactical Logo

Tombstone Tactical

800-606-0370

Sig Sauer RM400-16B-C M400 Rifle 5.56mm 16in 30rd Black

M400 in 5.56mm NATO, Sig Sauer part number RM400-16B-C

The Sig Sauer RM400-16B-C M400 Rifle in 5.56mm features a 16-inch chrome lined barrel with 1-7" twist, black finish, collapsible stock, front post sight, flash hider, direct impingement gas operating system with rotating locking bolt, an overall length of 39 inches, an unloaded weight of 6.5 lbs, and a 30+1 round capacity.

From the manufacturer

Sig Sauer M400 Semi-automatic AR 223 Rem 556NATO 16" Black Synthetic 30Rd RM400-16B-C

  • Action - Semi-automatic
  • Barrel Length - 16"
  • Capacity - 30Rd
  • Finish/Color - Black
  • Caliber - 223 Rem
  • Caliber - 556NATO
  • Grips/Stock - Synthetic
  • Manufacturer - Sig Sauer
  • Manufacturer part # - RM400-16B-C
  • Model - M400
  • Type - AR

THE SIG M400 SERIES TACTICAL RIFLE, designed for use in law enforcement, military operations, or the sporting field as well as competitive shooting. The SIG M400 is a true AR platform tactical rifle. Provides unparalleled accuracy, with a 16" chrome-lined and phosphate coated barrel that provides maximum durability and corrosion resistance. A 7075-T6 aircraft grade aluminum forged lower receiver adds to the durability and reliability.

About Sig Sauer

Sig Sauer manufactures perhaps the finest handguns and rifles made today

Availability: IN STOCK

This product is in stock and ready for sale. - A product status of In Stock indicates that as of the latest update, this product is on hand and ready for sale. It will most likely ship within 1-2 business days of receiving payment and proper paperwork.

You may order the Sig Sauer M400 Rifle 5.56mm 16in 30rd Black online now. Please click here or contact our sales department to place your order.

Pricing and Payment Methods

In order to be competitive, our prices reflect a 3% discount for payment by cash, check, or money order. Other forms of payment will be subject to an additional $29.78 in processing fees. Arizona residents are subject to 8.3% sales tax.

Shipping Requirements

When purchasing a firearm or other restricted item, federal law requires that it MUST ship to a licensed dealer in your state. If you need assistance locating a dealer to have your firearm shipped to, please contact us or enter your zip code at the GunBroker FFL dealer network website.

Flat rate and free shipping only applies to the contiguous US. AK, HI, and other territories will incur additional shipping fees. Not all items can legally ship to all 50 states. Please be sure this item is legal in your location before placing an order. If in doubt, please contact us. In order to keep our prices low, cancelled orders will be subject to a 10% cancellation fee.

NOTICE: Photos, descriptions, and stock status may be inaccurate. While we try our best to keep the information current, Tombstone Tactical can not be held liable for discrepancies. Please contact us with any questions.


AR-15 Rifles in Other Calibers from Sig Sauer




Tombstone Tactical
10011 N Metro Pkwy E.
Phoenix, AZ 85051
800-606-0370