MaddMacs Precision 4.5" XBAR MKIV upper on a Ruger MKIV frame. Threaded 1/2x28, 2 mags included, optics plate ready for Burris Fastfire, Vortex Venom etc. Additonal plates can be purchased from MaddMacs for your optic of choice. No trades and valid AL ID required for purchase. 2o5-two49-8o3nine. No shipping.