This is a Radical Firearms AR known as the Forged chambered in 223 Wylde, model RF00042.
The Radical Firearms 16" medium contour .223 Wylde AR rifle uses MIL-STD Upper and lower receivers along with the 15" RPR free float rail system for increased accuracy" keeping your hands cool" and giving you plenty of room for accessories.
Features:
RF Forged Mil-Spec Rifle
223 Wylde
16 Barrel, HBAR Contour,1:8 Twist;15 RPR Handguard with M-LOK
B5 Bravo Stock and B5 type 23 Pistol Grip
A2 Flash Hider
30 Round Magazine