Not all AR-15 lowers are equal. You can either decide to get a billet or a forged one. The AR-15 lower has different styles, and the material used in production can vary from polymers to various aluminum alloys. There are many jig options for each platform, which we will cover https://keeganfmrwz.dbblog.net/53935503/eine-geheimwaffe-für-80-percent-lower