Bolt-ons are carried out by automobile enthusiasts or those who are called modders. There isn't a standard bolt-on since modders are unique from each other. A whole bolt-on to at least one modder is just a partial bolt-on to another. That’s how varied this industry of endeavor is. Edyta Szewczyk https://redhotbookmarks.com/story17983322/bolt-carrier-groups-online-for-dummies