SIG Sauer just introduced the M400 TREAD—a premium entry-level modern sporting rifle—along with an extensive line of TREAD-branded accessories that gives the consumer the freedom to grow.

The new 5.56 NATO rifle is built on an aluminum frame with a 16-inch stainless steel barrel. The receiver houses a single-stage polished/hard-coat trigger and ambidextrous controls, attached to a Magpul SL-K 6 position telescoping stock and a mid-length gas system. A Picatinny rail tops off the TREAD, and a free-floating M-LOK handguard provides a solid grip and ample space to mount accessories.

“SIG Sauer has created a premium rifle, at a moderate price point, that is packed with innovation and flexibility, and does not sacrifice the quality that our consumers demand from SIG,” began Tom Taylor, Chief Marketing Officer and Executive Vice President SIG Sauer, Inc. “The base model of the TREAD is loaded with features that would be considered costly upgrades from our competitors base model. At this price point, most rifles are equipped with a barrel mounted sight post that blocks your field of view when using optics. Right out of the box, the TREAD features a factory-installed, aluminum, free floating M-LOK handguard for improved accuracy, and can be easily removed with two hex screws to change out to the TREAD accessory option.”

The right profile of the new SIG Sauer TREAD rifle.
The right profile of the new SIG Sauer M400 TREAD rifle. SIG Sauer

Customization is in the TREAD’s DNA, with a long line of accessories available from SIG. Those interested in changing their rifle to better suit their needs can choose from 13- or 15-inch M-LOK handguards with lightening cuts to reduce weight, an ambidextrous charging handle made of aircraft grade aluminum and a dual roll pin design, a 3-chamber compensator, and a factory upgraded flat blade, single-stage trigger. Multiple configurations of M-LOK grip kits made of high strength polymer are also offered.

Optics options include a ROMEO5 optic featuring a 2-MOA dot with 10 illumination settings, MOTAC, and 50k battery life. Consumers can also choose flip-up front and rear iron sights that are easy to install, adjustable, and deploy quickly, or an M-LOK front sight adapter with co-witness height made of lightweight aluminum.

The new rifle includes either a 15- or 13-inch M-LOK handguard.
The new rifle includes either a 15- or 13-inch M-LOK handguard. SIG Sauer

“It was important to us that TREAD owners had the freedom to easily, and affordably, tailor their rifle for their preferences. With this launch, we have created a full line of TREAD branded accessories that gives our consumers the freedom to grow, and customize their TREAD rifle. The TREAD accessories are premium interchangeable parts that require no specialty tools or armorer training, and are available for purchase with the TREAD rifle in stores today,” continued Taylor. “This rifle, combined with the accessories, both premium SIG Sauer products offered at a budget-friendly price, will set a new standard for the industry, and our entire TREAD brand can best be defined as the new face of freedom.”

SIG has priced the TREAD at $951, with accessories starting at $29. For more information, visit

M400 TREAD Rifle Specs:

  • Total Length: 30.8 inches
  • Barrel Length: 16 inches
  • Weight (including magazine): 7 pounds
  • Height: 7.5 inches
  • Width: 2.5 inches
  • Barrel Twist: 1:8 inches

M400 TREAD Branded Accessories

  • M-LOK 15- inch Handguard: $149.00
  • M-LOK 13-inch Handguard: $149.00
  • ROMEO 5 Optic: $149.00
  • Adjustable Flip-Up Sights: $149.00
  • Single-Stage Trigger: $119.99
  • Ambidextrous Charging Handle: $49.00
  • 3-Chamber Compensator: $49.00
  • M-LOK Front Sight Adapter: $29.00
  • M-LOK Hand-Stop Kit: $29.00
  • M-LOK Vertical Grip Kit: $29.00