Sig Sauer SIG M400 5.56 NATO AR-15 Semi-Auto 16” Rifle w/ Romeo5 Red Dot

SOLD FOR: $1,100

WOA#: WY231220KT001

Make: Sig Sauer

Model:  M400

Serial Number: 20L161597

Year of Manufacture: Modern

Caliber: 5.56/.223

Action Type: Semi-Automatic, Direct Impingement

Markings:  The left side of the upper receiver is marked “SIG SAUER SIG M400”.  The left side of the receiver is marked  “SIG SAUER INC. / NEWINGTON  / NH, USA / 20L161597” with bullet pictograms for the safety options.  The left side of the gas block is marked “SIG SAUER”. The left side of the magazine well is stamped with the SIG SAUER logo.   The barrel is also marked at the front at the bottom “5.56 NATO ?”.

Barrel Length: Stainless steel 16”.  17 1/2” with 3 Prong flash hider.

Sights / Optics:  The top of the receiver is a flat top picatinny rail with a mounted “SIG SAUER” Romeo5 red dot sight.  Also it has an adjustable “MAGPUL MBUS” rear adjustable flip sight.  The front sight is a “MAGPUL MBUS” adjustable flip down sight.

Stock Configuration & Condition:  The buttstock is a MAGPUL MOE SL-K Telescoping Stock.  The buttstock features sling slots and rubber buttpad.  The hand guard is a free-floating M-LOK enhanced handguard that is lightweight yet rigid for extreme control and ease of mounting accessories.  It is mounted with a “SIG SAUER” Tread Vertical Grip kit, which consists of a vertical grip, and hand stop. The pistol grip is a “SIG SAUER” polymer with storage compartment. The LOP measures 14” from the front of the trigger to the back of the fully extended buttpad.  The stock rates in Excellent condition with little to no sign of handling wear.  Has ambidextrous safety.

Magazine Quantity & Condition: 2 Lancer 30rd magazines, 1 clear red plastic Lancer 30rd magazine, and 1 PMAG 30rd magazine.  All magazines are in Excellent condition.

Type of Finish:  Black

Finish Originality: Original

Bore Condition: The bore is bright and the rifling is sharp.  There is no erosion in the bore.  In this writer’s opinion the bore rates 9/10.

Overall Condition:  This rifle retains about 99% of its metal finish. The balance of the finish does not appear to show any operational wear. The screw heads are sharp and pins are unmarred. The markings are clear. Overall, this rifle rates in about Excellent condition.

Mechanics:  The action functions correctly.  We did not fire this rifle. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance requirements.  Has ambidextrous safety and mag release.

Box, Paperwork & Accessories:  This rifle comes with 4 magazines as stated above.

Our Assessment: The Sig Sauer M400 is a direct impingement AR-15-style rifle that’s built to meet the high standards set by Sig Sauer, a renowned firearms manufacturer. It’s chambered in the widely popular 5.56x45mm NATO cartridge, offering excellent ballistic performance and ammunition availability.

One of the standout features of the M400 is its build quality. It’s built on a sturdy and reliable platform, utilizing high-quality materials and precise manufacturing techniques. The rifle incorporates a durable upper and lower receiver, ensuring long-lasting performance and resistance to the elements.

Another key aspect of the M400 is its versatility. It comes with a range of customization options, allowing you to tailor the rifle to your specific needs and preferences. Whether you’re looking to add optics, lights, or other accessories, the M400’s modular design makes it easy to customize and adapt to your shooting style.

So, whether you’re a professional in the market for a reliable duty rifle or a shooter looking for a versatile and high-performance AR-15, the Sig Sauer M400 is definitely worth considering.  It combines Sig Sauer’s renowned craftsmanship with the proven reliability of the AR-15 platform, making it a formidable choice in any shooting scenario.  Please see our photos and good luck bidding! C.J.

Sig Sauer SIG M400 5.56 NATO AR-15 Semi-Auto 16” Rifle w/ Romeo5 Red Dot
Sig Sauer SIG M400 5.56 NATO AR-15 Semi-Auto 16” Rifle w/ Romeo5 Red Dot