Anderson Lower (purchased at local gun show), PSA 16" 5.56 NATO 1:7 Midlength Nitride 13.5" Lightweight M-LOK MOE EPT Rifle Kit W/ MBUS Sight Set, Vortex Strikefire II 4 MOA Red Dot. Wish I lived in SC so I could get my lowers from PSA. Great build and if you watch the sales you can’t beat the prices.