Sig RM400SDI16BR5FX M400 5.56 NATO 16" 30+1 Semi-Auto Black Rifle
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Sig Sauer | M400 Sentry | MPN: RM400-SDI-16B-R5FX | UPC: 798681716128 | .223 REM | 5.56 NATO | Semi-Auto | 16" Barrel | 30+1 | 36.5" OAL | 8 lbs
Features a ROMEO5 GENII red dot sight and a Foxtrot-MSR light. Includes a collapsible Magpul MOE-SL stock and adjustable vertical foregrip.
Specifications:
- Brand: Sig Sauer
- Model: M400 Sentry
- MPN: RM400-SDI-16B-R5FX
- UPC: 798681716128
- Caliber: .223 REM | 5.56 NATO
- Action: Semi-Auto
- Barrel Length: 16"
- Twist Rate: 1:7
- Threaded Barrel: Yes
- Thread Pitch: 1/2x28
- Overall Length: 36.5"
- Weight: 8 lbs
- Capacity: 30+1
- Finish: FNC
- Frame Material: Threaded
- Sights: ROMEO5 GENII Red Dot with 2 MOA Dot
- Stock: 6 Position Magpul MOE-SL
- Grips: Collapsible / Folding
- Safety Type: Ambidextrous
- Trigger Type: Sig Two-Stage Matchlite Duo
- Magazine Type: 30 rd. Polymer Magazine
- Hand: Ambidextrous
- Light Output: 1250 Lumens, 33000 Candela
- Waterproof Rating: IPX7
- Includes: Three M-LOK Rail Covers
Technical Specifications
| Caliber | 223 Rem | 5.56 NATO |
|---|---|
| Capacity | 30 |
| Barrel Length | 16.00" |
| Action Type | Semi-Auto |
| Finish | FNC |
| Overall Length | 36.50" |
| Frame Material | Alloy |
| Receiver Material | Alloy Steel |
| Stock Material | 6 Position Magpul MOE-SL |
| Barrel Description | Threaded |
| Trigger Type | Sig Two-Stage Matchlite Duo |
| Safety | Ambidextrous Thumb Safety |
| Grips | Polymer |
| Thread Pitch | 1/2x28 |
| Twist Rate | Sig Flash Hider |
| Magazine Type | Polymer AR Style Magazine |
| Manufacturer | Sig Sauer |
| Model | SIGM400 |
| SKU | B1199656 |
| UPC | 798681716128 |
| Weight | 8 lbs. |
| Magazines Included | 1 30 rd. |
| Threaded Barrel | Yes |
| Color | Black |
| Availability | In Stock |
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Shipping & Returns
Ships to your local FFL
This firearm ships to a licensed dealer (FFL) near you for pickup, not to your home. You'll choose your FFL during checkout — and if you don't have one in mind, we'll help you find a nearby dealer. You complete the background check and pick it up there.
Shipping Information
- Orders typically process within 1-2 business days
- Firearms ship via FedEx or UPS with signature required
- Tracking information provided for all orders
- Shipping costs calculated at checkout based on weight and destination
- Total delivery time to FFL: typically 3-5 business days
Return Policy
- Firearms must be returned unfired and in original packaging within 3 days of FFL transfer
- 15% restocking fee applies to all firearm returns
- Contact us for return authorization before shipping items back
- Original shipping costs are non-refundable
Questions?
Contact us at 502-272-4859 or submit a question for assistance with shipping or returns.
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