SIG Sauer M400 SDI XSeries .223 Remington/5.56 NATO Rifle
Specifications
Action Double Action
Finish Black
Sights Red Dot Sights
Weight 8.04 pounds
Capacity 30+1
Grip Safety No
Optic Ready Yes
Barrel Length 16 inches
Manual Safety Yes
Overall Length 36.5 inches
Caliber / Gauge .223 Remington, 5.56 NATO
Threaded Barrel Yes
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to WWW.P65WARNINGS.CA.GOV
Description
Product Overview
The SIG Sauer M400 SDI XSeries semi-automatic rifle is built on an AR-style platform chambered for .223 Remington / 5.56 NATO. This 16-inch configuration features a 1-in-7 twist barrel, a threaded 1/2x28 muzzle, and a 2-stage match trigger for consistent, precise shot-to-shot performance. The set includes an optic, bringing a ready-to-shoot configuration for range and practical use.
Key Features
- Chambered in .223 Remington / 5.56 NATO for versatile ammunition compatibility
- 16-inch barrel with 1-in-7 twist for stable performance across common bullet weights
- Threaded 1/2x28 muzzle for common muzzle devices and accessories
- 2-stage match trigger for a crisp, controlled break
- Includes a Romeo5 Gen II Compact optic setup for faster target acquisition
- 30+1 magazine capacity for extended shooting sessions
If you want an AR-style rifle configuration that balances a match-style trigger feel with a threaded barrel and an optic-ready setup, the SIG Sauer M400 SDI XSeries is a strong choice.
5.0 | 1 Reviews
- SKU:
- RM400SDI16BR5FX
- UPC:
- 798681716128
- BUDS ID:
- 179055
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Latest Reviews
Michael C.
8 months ago
Verified Purchaser
Picked up the SIG...
Picked up the SIG SAUER M400 SDI XSeries 223 Rem | 5.56 NATO from Buds Gun Shop and I'm honestly impressed. The ordering process was super easy, and I got helpful updates every step of the way. The rifle showed up right on schedule and in perfect condition — zero issues. First time at the range, it ran flawlessly: accurate, lightweight, and feels solid in the hands. I appreciated that Buds had clear product info and straightforward checkout (plus a nice discount for members). No complaints at all about their customer service; quick replies and friendly staff. If you're looking for a reliable AR platform and a good buying experience, Buds Gun Shop made it stress-free and I'd shop here again.
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Retail Availability
Bud's Gun Shop - Lexington, KY
1105 Industry Road, Lexington, KY 40505
Bud's Gun Shop - Sevierville, TN
2270 Two Rivers Blvd, Sevierville, TN 37876
Uncle Lee's - Greenville, KY
820 Main St, Greenville, KY 42345
