I have a custom AR with about 100 rds through it. IT has an Aero M4E1 Texas FDE Lower with EPT Lower parts kit. Aero FDE Upper w/ Aero 15" FDE R-One Hand guard, 16" Stainless Midlength BA Hanson Barrel w/ Pinned Gas Block. BA BCG. Radian Raptor Charging Handle. YHM Muzzle Brake and FDE MBUS set . Have about $1200 in the build.