SIG SAUER M400 Tread 5.56 NATO/.223 Rem. Semi-automatic AR-15 Rifle Introducing the first M4 to earn the SIG name. With the M400, SIG SAUER didn't just set out to make a bog-standard AR. Instead, they utilized the innovation, performance and attention to detail that defines other SIG rifles to evolve the platform. The result is the SIGM400, a superior system offering advanced features available right out of the box that were once only found on the after-market. It starts with the premium 16 inch stainless steel barrel that delivers greater accuracy than standard 4140 steel. It comes capped with an effective 3-prong flash hider. The factory-upgraded flat-blade, single-stage trigger comes polished for extra smoothness, giving you a higher degree of control. The free-floating M-Lok handguard features lightening cuts, and won't affect accuracy. And the best part? Despite the vast array of upgrades, it's still a great value. Buying a bare-bones AR and customizing it would cost you quite a bit morea |and you STILL might not be getting this level of performance out of the box. 16 inch stainless steel barrel delivers enhanced accuracy Magpul SL-K 6-position stock M-LOK handguard with lightening cuts to reduce weight Handguard is free-floated for greater accuracy Polished single-stage trigger delivers a smoother, lighter pull than 2-stage mil-spec triggers 3-prong flash hider Aircraft aluminum charging handle Includes (1) 30-rd. magazine Order today!