For sale is a used Sig M400 Tread in 5.56, painted with Brownell's Aluma-Hyde earth brown. Has some chips/scuffs but this paint is way more durable than spray paint and feels better. Have leftover paint if you want to touch it up but it's quite a long curing process. 
Anyway, full ambidextrous controls (yep she goes both ways) ambi mag release, safety selector, charging handle and qd sling points. This model has a mid-length gas system and is super reliable.

Factory Tread iron sights (all metal), vertical grip and some qd rails on her. The optic is a Trybe 3X etched reticle w/red illumination, zeroed around 50 yards. Hogue G10 15° grip. Magpul sling and 2 metal mags. Bill of sale/AZ ID thx