Receiver set is the main part of the firearm which is considered as a house for internal components known as hammer, bolt, breechblock, action & firing mechanism. The Receiver set is divided into two main parts: Upper Receiver & Lower Receiver. Upper receiver is the top most part of receiver assembly and is secured by two pins. Lower Receiver is the lower part and the part which does originally holds the weapon’s serial number. Usually Receiver set is made up of stamped steel, aluminium, polymers and sintered metal.
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