Sig Sauer M400 Rose 5.56mm Rifle 16in Rose Black Romeo 5X2
by Sig Sauer
User Ratings
No ratings yet
Be the first to review this product
SIG SAUER M400 Rose AR-15 rifle chambered in 5.56 NATO. Features a 16-inch Chrome/Moly steel barrel with 1:7 twist, ambidextrous controls, a free-floating 10-inch M-LOK handguard with Rose engraving, Romeo5 Gen II red dot, mid-length Direct Impingement gas system, and a 6-position Magpul MOE-SL stock. Comes with two 30-round polymer magazines.
Specifications
- Manufacturer:
- Sig Sauer
- Category:
- upper-receiver
- Caliber:
- 5.56x45mm NATO
- Platforms:
- AR-15
- Interfaces:
- Muzzle thread: 1/2-28
- Weight:
- 112 oz (7.00 lbs)
- Length:
- 33.3" - 36.5"
- UPC:
- 798681716593
- MPN:
- RM400-16B-ROSE-R5X2
- Required Component:
- Yes
Parts Cabinet
Track parts you own or plan to buy.
Where to Buy
Sponsored
MantisX
The smart way to train your AR build
Built your rifle — now train it. BlackBeardX installs in minutes and turns your AR into a full dry fire system with smart feedback on every pull.
Shop BlackBeardXPrice History
Current
$1,399.99
Lowest
$1,399.99
Highest
$1,399.99
Price Alert
Sign in to save a target price and receive an email when this component drops.
Sign In to Set AlertWhat's Included in this Bundle
Similar Products
Bravo Company BCM4 Upper Receiver Assembly Flat Top With Forward Assist 1913 Rail
Bravo Company Manufacturing (BCM)
$129.00
Aero Precision AR-15 Assembled Upper Receiver, Black (APAR501603AC)
Aero Precision
$123.99
BCM MK2 Flat Top Upper Receiver Assembly, Black (BCM4-UR-MK2)
Bravo Company Manufacturing (BCM)
$129.95
LMT Monolithic Upper Receiver - AR-15 - MRP-L - M-LOK - Specwar - 11.5"
LMT
$940.50
BCM MK2 12.5" 5.56 Carbine Barreled Upper with MCMR-10 Handguard
Bravo Company Manufacturing (BCM)
$820.39
BCM MK2 BFH 11.5" 5.56 Carbine Barreled Upper with MCMR-10 Handguard
Bravo Company Manufacturing (BCM)
$903.99
Griffin Armament Mk1 Upper Receiver Assembled Aluminum Black
Griffin Armament
$113.95
BCM M4 Upper Receiver Assembly, 7075-T6, Black Anodized (4URM4)
Bravo Company Manufacturing (BCM)
$137.04
Builds Using This Part
No builds yet — be the first to use this part.
Related Guides
Guide
5.56 NATO, .223 Remington, and .223 Wylde: Chamber Differences Explained
A technical breakdown of the differences between 5.56 NATO, .223 Remington, and .223 Wylde chambers — what each accepts safely, and how to choose for your build.
5 min read
Guide
AR-10 Receiver Patterns: DPMS vs. Armalite Compatibility
The AR-10 has two incompatible receiver patterns — DPMS and Armalite — that look similar but do not share parts. This guide explains the differences and how to buy correctly.
6 min read
Guide
The AR-10 Platform: What It Is and How It Differs from the AR-15
A practical overview of the AR-10 — its origins, how it differs from the AR-15, available calibers, and when it makes more sense than a standard AR-15 build.
6 min read