Filters
Account Wishlist
My CART
{brtheme_woo_cart_item_count}

My Cart ({brtheme_woo_cart_item_count})

Oops! There is nothing in your cart, yet. Here's what you can do:

Close modal

or

Shop Now

SIG RM400SDI16BR5FX M400 SDI 556 16 BLK TELE

SIG RM400SDI16BR5FX M400 SDI 556 16 BLK TELE

$1,749.99

Out of stock

This item is not currently stocked but may be available by special order. Please allow an additional 1–2 weeks for processing; we will contact you once availability is confirmed.

Disclaimer: It is the customer’s responsibility to ensure that all orders comply with applicable local and federal regulations. Non-compliant orders are subject to a 30% restocking fee. We reserve the right to dispute any chargebacks related to such orders.

Guidelines for Shipping Restrictions by State

The M400 Sentry offers a ready-to-go solution, combining the M400-SDI X platform with the multi-purpose functionality of the ROMEO5 GENII red dot and the Foxtrot-MSR Full Size Light. The M400-Sentry is furnished with a vertical foregrip on the free-floating handguard, enabling greater control of the rifle regardless the shooting position. The ROMEO5 GENII red dot with its 1x aiming solution and crisp 2 MOA dot, provides over 40,000 hours of estimated runtime compliments of SIG SAUER’s motion-activated MOTAC design. The ROMEO5 GENII is IPX7 waterproof rated, and its fully-multicoated lenses ensure visibility in all environments. Top mount illumination controls provide ease of use by both left and right-handed shooters. The Foxtrot-MSR full size light with its 1,250 Lumens and 33,000 Candela, clearly illuminates targets while maintaining ease of use and accessibility. Includes three M-LOK rail covers and a 30rd polymer magazine.

Your Trusted Online Firearms Store – Shop with Confidence!

Looking for the best prices on SIG RM400SDI16BR5FX M400 SDI 556 16 BLK TELE by Sig Sauer? ADA Armaments LLC proudly serves Boise with unbeatable pricing, expert service, and exclusive rewards.

Best Prices in Boise.
Earn Rewards on Every Purchase.
Special Bundles & Firearm Packages Available.
Safe & Secure Checkout – Shop with confidence using trusted payment options.
Compliance-Ready – All sales follow federal, state, and local firearm laws.

No shipping to California.

Limited Stock – Visit Us Today or Shop Online Before They’re Gone! 

UPC

798681716128

Manufacturer

Manufacturer Part Number

RM400-SDI-16B-R5FX

Action

Semi-Auto

ATF Type

MODERN SPORTING RIFLE

Barrel Length

16

Caliber/Gauge

.223 REM/5.56 NATO

Capacity

30

Length

46.1000

Magazine Included

1 x 30-Round

Model

M400

Number of Magazines

1 30 rd.

Package Height

4.0

Package Width

11.5

Product Type

AR

Rate of Twist

1:7"

Safety

Ambidextrous

Shipping Weight

10.8

Sights

No

State Restriction (CA)

NO DIRECT SHIP TO CALIFORNIA

State Restriction (RI)

NO DIRECT SHIP TO RHODE ISLAND

State Restriction (WA)

NO DIRECT SHIP TO WASHINGTON

SKU: ZND|GRM400SDI16BR5FCategories: AR RiflesTags: Online Only

The M400 Sentry offers a ready-to-go solution, combining the M400-SDI X platform with the multi-purpose functionality of the ROMEO5 GENII red dot and the Foxtrot-MSR Full Size Light. The M400-Sentry is furnished with a vertical foregrip on the free-floating handguard, enabling greater control of the rifle regardless the shooting position. The ROMEO5 GENII red dot with its 1x aiming solution and crisp 2 MOA dot, provides over 40,000 hours of estimated runtime compliments of SIG SAUER’s motion-activated MOTAC design. The ROMEO5 GENII is IPX7 waterproof rated, and its fully-multicoated lenses ensure visibility in all environments. Top mount illumination controls provide ease of use by both left and right-handed shooters. The Foxtrot-MSR full size light with its 1,250 Lumens and 33,000 Candela, clearly illuminates targets while maintaining ease of use and accessibility. Includes three M-LOK rail covers and a 30rd polymer magazine.

Your Trusted Online Firearms Store – Shop with Confidence!

Looking for the best prices on SIG RM400SDI16BR5FX M400 SDI 556 16 BLK TELE by Sig Sauer? ADA Armaments LLC proudly serves Boise with unbeatable pricing, expert service, and exclusive rewards.

Best Prices in Boise.
Earn Rewards on Every Purchase.
Special Bundles & Firearm Packages Available.
Safe & Secure Checkout – Shop with confidence using trusted payment options.
Compliance-Ready – All sales follow federal, state, and local firearm laws.

No shipping to California.

Limited Stock – Visit Us Today or Shop Online Before They’re Gone! 

UPC

798681716128

Manufacturer

Manufacturer Part Number

RM400-SDI-16B-R5FX

Action

Semi-Auto

ATF Type

MODERN SPORTING RIFLE

Barrel Length

16

Caliber/Gauge

.223 REM/5.56 NATO

Capacity

30

Length

46.1000

Magazine Included

1 x 30-Round

Model

M400

Number of Magazines

1 30 rd.

Package Height

4.0

Package Width

11.5

Product Type

AR

Rate of Twist

1:7"

Safety

Ambidextrous

Shipping Weight

10.8

Sights

No

State Restriction (CA)

NO DIRECT SHIP TO CALIFORNIA

State Restriction (RI)

NO DIRECT SHIP TO RHODE ISLAND

State Restriction (WA)

NO DIRECT SHIP TO WASHINGTON

Welcome to ADA Armament, in order to browse our site you must be at least 18 years of age.

Are you at least 18 years old?

YesNo