Bolt-ons are carried out by car enthusiasts or those who are called modders. There is no conventional bolt-on due to the fact modders are diverse from each other. A whole bolt-on to 1 modder is just a partial bolt-on to a different. That’s how diversified this field of endeavor is. https://hypebookmarking.com/story17813232/bolt-carrier-group-materials-for-dummies