The M400 TREAD is an optics ready, aluminum frame rifle.https://sigsauer-usa.com/  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.

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.