It is the lower receiver among all the ar parts of the AR 15 that is considered as a gun. Hence to have one in possession one needs to go through all the similar formalities as in case of purchasing a gun. One must make sure to go through the laws surrounding the arms and ammunition one can purchase and keep. The local and country laws regarding these are really important and should under no circumstances be neglected or violated. It is the responsibility of the purchaser and not the manufacturer. In some states, the government has made mandatory the issuing of Federal Firearms License with every billing of a rifle. The AR15’s lower receiver is a complete gun by itself. Hence a person who wants to possess this must follow some special rules like having a unique and important paperwork.
The seller needs to just ship the copy of the license to the gun shop and in turn, collect the amount from the buyer. The local gun shop then does the remaining formality. The owner of the gun needs to fill an ATF and pay some money for transfer and instantly collect the new ar15. Some countries though have to wait time to deliver the rifle and some take time to verify the papers. Gun can be bought online as well as from any known or unknown shop. What the seller looks for is The ATF form. That is the only important thing the buyer must present to the seller while purchasing a gun and instantly carry the gun home.
There are various qualities of products available in the market of very famous and not so famous brands. All of them do not have the name of the brand encrypted on it.