Folks, here is an ATF letter saying that an angled foregrip (AFG), such as Magpul’s models, can be used on an AR pistol. This is the first time someone shared a definitive letter with me vs. hearsay.
12/14/2014 Update: Here are scanned images of two different ATF letters saying AFGs can be used on AR pistols because they are not considered vertical grips:
This is a second letter wherein they answer a number of good questions about AR pistols in general. On page three is another comment that the AFG is allowed:
The reason this matters is that a vertical foregrip is not legal without first registering the pistol as an “any other weapon” or AOW. I recommend people print and keep copies of letters just in case they need to show someone that some aspect of a weapon was “approved” by the ATF at some point. Just bear in mind that ATF letters are not absolutes but it helps to have them handy if asked. A state or local government may have their own more restrictive regulations as well so this may not mean AFGs are legal for everyone everywhere.
Legal Disclaimer: I am not an attorney and am not giving legal advice. I am just passing this information along and it is up to you to determine what you can/can’t do.
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Sources For AR Parts
The following are all vendors of AR parts including barrels, handguards, triggers, magaziness and what have you that I use and recommend:
Beware no-name knock off websites selling generic import stuff. Some of the parts are counterfeit and not rated for firearms use.