Sig Sauer M400 X-Series 5.56 NATO 16" 30+1 Black Magpul SL-K Stock Flat Match Trigger
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Sig Sauer | SIGM400 (M400 X-Series) | MPN: RM400-SDI-16B-P | UPC: 798681664634 | Black (FNC) | 5.56 NATO / .223 Rem | Semi-Auto | 16" Barrel | 30+1 | 33.5" - 36.8" OAL | 7 lbs | 1:7 Twist | 15" M-LOK Handguard | Magpul SL-K Collapsible Stock | Flatblade Match Trigger | Thread Pitch 1/2x28
15" free-float M-LOK handguard. Hybrid flash hider/compensator muzzle device. Ambidextrous controls.
Specifications:
- Brand: Sig Sauer
- Model: M400 X-Series (SIGM400)
- MPN: RM400-SDI-16B-P
- UPC: 798681664634
- Product Type: Firearm
- Category: Semi Auto Rifles
- Caliber: 5.56 NATO
- Also Accepts: .223 Remington
- Action: Semi-Auto
- Capacity: 30 + 1
- Barrel Length: 16"
- Barrel Material: Chrome Moly Steel
- Barrel Profile: (Chrome Moly Steel)
- Twist Rate: 1:7
- Muzzle Device: Hybrid Flash Hider / Compensator
- Threaded Barrel: Yes
- Thread Pitch: 1/2x28
- Handguard: 15" M-LOK Free-Float
- Overall Length: 33.5" - 36.8"
- Weight: 7 lbs.
- Finish: FNC
- Frame / Receiver Material: Black Anodized Aluminum
- Stock Material: Synthetic
- Stock: Magpul SL-K 6-Position Collapsible
- Grips / Grip Type: Collapsible / Magpul SL Stock
- Sights: (no iron sights specified)
- Sights / Reference: 1:7 (twist rate)
- Trigger Type: Flatblade Match
- Safety Type: Ambidextrous
- Magazine Type: 1 x 30 rd. detachable
- Hand: Right
- Color: Black
- Country of Origin: (not listed)
Technical Specifications
| Caliber | 223 Rem | 5.56 NATO |
|---|---|
| Capacity | 30 |
| Barrel Length | 16.00" |
| Action Type | Semi-Auto |
| Finish | FNC |
| Overall Length | 33.50" |
| Frame Material | Chrome Moly Steel |
| Receiver Material | Aluminum |
| Stock Material | Magpul SL |
| Barrel Description | Chrome Moly Steel |
| Trigger Type | Flatblade Match |
| Safety | Manual Safety |
| Grips | Polymer |
| Thread Pitch | 1/2x28 |
| Twist Rate | Hybrid Compensator/F |
| Magazine Type | Polymer AR Style Magazine |
| Manufacturer | Sig Sauer |
| Model | SIGM400 |
| SKU | D728918 |
| UPC | 798681664634 |
| Weight | 7 lbs. |
| Magazines Included | 1 30 rd. |
| Threaded Barrel | Yes |
| Color | Black |
| Availability | In Stock |
Customer Reviews
Excellent
Great buying experience item arrived fast and as ordered
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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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