All the features, all the freedom – none of the compromises The M400 TREAD is an optics ready, aluminum frame rifle. TREAD features a 16” stainless steel barrel with a free-floating M-LOK handguard, a single-stage polished/hard-coat trigger, ambidextrous controls, a Magpul™ SL-K 6 position telescoping stock, a mid-length gas system, and is available in 5.56 NATO.

SIG RM400-16B-TRD

Retail: $879.99
Price: $799.00
You Save: $80.99 (9.2%)
Availability: Out Of Stock / Not Available For Back Orders
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The TREAD branded accessories include:

  • M-LOK handguard with lightening cuts to reduce weight, available in 13” and 15” lengths
  • 3 chamber compensator
  • Ambidextrous charging handle made of aircraft grade aluminum and a dual roll pin design
  • ROMEO5 optic featuring a 2MOA dot with ten illumination settings, MOTAC, and 50k battery life
  • Flip-up front and rear iron sights that are easy to install, adjustable, and deploy quickly
  • M-LOK front sight adapter with co-witness height made of lightweight aluminum
  • Multiple configurations of M-LOK grip kits made of high strength polymer
  • Factory upgraded flat blade, single stage trigger.

Order Details

  • Not available where prohibited by law
  • Proof of eligibility is required and we will keep a copy of the eligibility on file.
  • Offer not available in all states
  • All web sales must go through a Federal Firearms Licensee
  • Your order confirmation will contain information on how to submit your qualification credentials and FFL's information
  • Coupon codes/Discount codes not applicable
  • Please check out the Individual Firearms Sales page for more details on the ordering process.
CALIBERB5.56 NATO
ARREL LENGTH16 in (292 mm)
MAGS INCLUDED1) 30rd Polymer Mag
MAG TYPE(AR-15
STATE COMPLIANT
ACTION TYPESemi-Auto
STOCK TYPE6-Position SL-K
BARREL MATERIALStainless Steel
TRIGGER TYPESingle Stage Polished/Hard-Coat
TWIST RATE1:8
FOREND TYPEAlloy
GRIP TYPEPolymer
RECEIVER FINISHHard Coat Anodized
OVERALL LENGTH (IN)30.8 in (782 mm)
OVERALL WIDTH2.5 in (64 mm)
HEIGHT7.5 in (191 mm)
THREADS1/2 in - 28 tpi
ACCESSORY RAILM-LOK
OPERATING SYSTEMDirect Impingement
WEIGHT (OZ)7 lbs (3.2 kg)