I have a few old Bushmaster parts that would be good for someone trying to build an AR15 on a budget. The AR15 bolt carrier is complete minus the firing pin, cam pin, fire pin retatining pin and bolt. It is chrome lined and is the unshrouded firing pin design. There is good staking on the gas key. $30 I also have the fire control group from the same rifle. The hammer is notched and it has seen around 1000 rounds. It comes with the hammer and trigger pins. A lower parts kit minus the fcg can be found online at Palmetto State Armory for about $25 to make a complete lower parts kit for around $35. Great for someone on a budget. $10 for the fcg.