SIG Sauer M400 5.56mm NATO AR-15, 16 in, Direct Impingement, Custom M-LOK Handguard, Magpul SL-K Stock, Threaded Barrel, 3 PMAGs
This SIG Sauer M400 is a full-size, direct-impingement AR-15 in 5.56mm NATO with a customized, purpose-built configuration. Highlights include a Magpul MOE SL-K collapsible stock, a flat-faced skeletonized trigger, a free-float M-LOK handguard with two bolt-on Picatinny rail sections, and a SIG SAUER M-LOK vertical foregrip/hand stop. The 16-inch, 1:8-twist barrel is threaded and capped with a three-prong flash hider. It comes with three 30-round Magpul PMAG Gen M3 magazines, the original manual, and a black Savior Equipment soft case.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
There are minor, superficial scratches and blemishes present.
What’s Included
- Savior Equipment soft rifle case (black)
- Original manual
- Three 30-round Magpul PMAG Gen M3 5.56x45 magazines
- SIG SAUER M-LOK vertical foregrip/hand stop (installed)
- M-LOK Picatinny rail sections (installed)
The receiver set is correctly marked, with the upper reading "SIG SAUER SIGM400" and the lower rollmarked "SIG SAUER INC, NEWINGTON NH, USA." The selector features clear SAFE/FIRE pictograms. A T-marked Picatinny rail runs along the top of the receiver, providing a solid mounting surface.
The free-float M-LOK aluminum handguard streamlines the front end and does not include an integral top rail. Two bolt-on M-LOK Picatinny rail sections are installed to add mounting points, and a SIG SAUER M-LOK vertical foregrip/hand stop is fitted for enhanced control.
Stock and controls are set up for practical use. The Magpul MOE SL-K collapsible stock keeps the rifle compact and stable, while the SIG SAUER polymer pistol grip offers a secure hold. The flat-faced, skeletonized trigger provides a crisp, consistent interface. A manual safety is present.
The 16-inch barrel features a 1:8 twist, a threaded muzzle, and a three-prong flash hider. The bore condition and rifling are excellent. The rifle is finished in black throughout, with a clean, uniform presentation.
This package includes three 30-round PMAG Gen M3 magazines, the original manual, and a quality Savior Equipment soft rifle case, rounding out a ready-to-use setup with useful accessories.