The proposed rule from ATF would amend the definition of "rifle" to include pistols equipped with stabilizing braces that have design features indicating they are intended to be fired from the shoulder. ATF proposes using a points system, with firearms receiving fewer than 4 points in two sections generally considered not designed for shoulder firing. However, ATF says it can still classify such firearms as short-barreled rifles. The proposal is opposed by gun rights groups who argue it would make millions of lawfully owned firearms illegal and have severe economic impacts.