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The M400 ROSE came out of SIG's ROSE program, a training and education initiative built alongside world champion competitive shooter Lena Miculek. When ROSE members asked for an AR-15 designed around their feedback, SIG delivered this rifle, and the result is a genuinely well-sorted package that works for anyone who wants a complete, ready-to-shoot setup. Underneath the rose gold controls and engraved handguard is the same M400 platform SIG has been building its reputation on for years.
The core of the rifle is a 16 inch chrome-moly barrel with a 1:7 twist, fed by a mid-length direct impingement gas system that smooths out recoil noticeably compared to carbine-length setups. SIG tops the muzzle with a hybrid flash hider and compensator in matte rose gold, threaded 1/2×28 if you ever want to swap it. The two-stage Matchlite Duo trigger is a real upgrade over the gritty mil-spec triggers most factory ARs ship with, giving you a clean, predictable break that makes accurate shooting easier from day one. Ambidextrous controls, a reduced-angle grip, and a 6-position Magpul MOE-SL stock let the rifle fit a wide range of body types and shooting styles, and at 7 pounds it stays manageable through long range sessions.
SIG mounts a ROMEO5 Gen II red dot at the factory, so you can head straight to the range, get zeroed, and start shooting. The 10 inch free-floating M-LOK handguard leaves plenty of room for a light, hand stop, or sling mount whenever you're ready to build it out further.
This one goes beyond the usual rifle-and-a-mag arrangement. You get two 30-round polymer magazines, a custom ROSE Savior soft carrying case, rose-colored dummy rounds for dry-fire and malfunction drills, and a rose gold combination lock. It's a thoughtful bundle that covers training, transport, and storage in one box, which is a big part of why this rifle has become such a popular first AR and a solid pick for experienced hands too.
Yes, the ROMEO5 Gen II red dot comes mounted from the factory, so there's nothing to buy or install before your first range trip. You'll still want to zero it with your preferred ammo, but that's a quick job. It also carries the ROSE logo to match the rest of the rifle.
It's one of the better starting points out there. The mid-length gas system keeps recoil soft, the two-stage Matchlite Duo trigger is far better than typical factory triggers, and the adjustable Magpul stock fits a wide range of builds. The included dummy rounds and case also make it easy to practice safe handling and dry-fire drills at home.
Yes. The rifle ships with fully ambidextrous controls, including the safety, so lefties can run it without workarounds. That was a deliberate design choice from the ROSE program to make the rifle fit as many people as possible.
It's chambered in 5.56 NATO, which means it safely runs both 5.56 and .223 Remington ammunition. The 1:7 twist barrel stabilizes heavier bullets well, so match loads in the 62 to 77 grain range shoot nicely, and lighter 55 grain range ammo works fine for everyday practice.
| UPC | 798681716593 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RM400-16B-ROSE-R5X2 |
| Action | |
| ATF Type | RIFLE |
| Barrel Finish | Black |
| Barrel Length | 16" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 30 + 1 |
| Color | Black |
| Length | 36.5'' |
| Magazine Included | 2 x 30-Round |
| Model | |
| Number of Magazines | 2 30 rd. Magpul Mags |
| Package Height | 4.0 |
| Package Width | 14.0 |
| Product Type | Rifle |
| Safety | Ambidextrous |
| Shipping Weight | 14.15 |
| Sights | Rose Stylized Romeo5 Gen II |
| 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 |
| Thread Pattern | 1/2"x28 |
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