Putting a foregrip on a pistol is legal only under specific conditions. A vertical foregrip on a handgun under 26 inches in overall length turns the weapon into an “any other weapon” (AOW) under the National Firearms Act, and installing one without prior ATF registration is a federal felony carrying up to ten years in prison. An angled foregrip, or a vertical foregrip on a pistol longer than 26 inches, generally does not trigger reclassification.
Why a Vertical Foregrip Reclassifies a Pistol
Federal law defines a pistol as a weapon designed to be fired with one hand. A vertical foregrip mounts forward of the magazine well and drops straight down, giving the shooter a two-handed hold. The ATF’s position is that once you install one, the weapon “is no longer designed to be held and fired by the use of a single hand,” so it stops being a pistol under the law.1Bureau of Alcohol, Tobacco, Firearms and Explosives. Adding a Vertical Fore Grip to a Handgun
Losing the pistol classification pushes the weapon into the NFA’s catch-all category. An AOW is any concealable weapon that can discharge a shot, excluding standard rifled-bore pistols and revolvers.2Office of the Law Revision Counsel. 26 USC 5845 – Definitions Because the foregrip strips the “pistol” label, the exclusion no longer applies, and the concealable weapon that remains fits the AOW definition.3Bureau of Alcohol, Tobacco, Firearms and Explosives. National Firearms Act Handbook – Section 2.1.5
The 26-Inch Length Exception
The AOW definition requires that the weapon be “capable of being concealed on the person.”2Office of the Law Revision Counsel. 26 USC 5845 – Definitions A handgun with an overall length exceeding 26 inches is generally too large to meet that concealability element, and the ATF has taken the position that adding a vertical foregrip to a pistol above that length does not create an AOW.
The resulting weapon doesn’t fit any NFA category. It isn’t a pistol (two-handed grip), isn’t a rifle (no stock, not fired from the shoulder), and isn’t an AOW (not concealable). It falls outside NFA regulation as what the firearms community calls a generic “firearm.” Owners of large-format pistols, including certain AR-platform builds, can add a vertical foregrip without NFA paperwork as long as overall length stays above 26 inches. Measure carefully; dropping below the threshold flips the classification back to AOW.
Angled Foregrips Are Treated Differently
Angled foregrips sit at a shallower angle rather than dropping straight down. The ATF has issued guidance letters confirming that adding an angled foregrip to a pistol does not reclassify it as an AOW. The agency treats an angled foregrip as a hand stop or support surface rather than a true second handgrip enabling a two-handed hold.
The statute doesn’t set a specific degree measurement that separates “angled” from “vertical.” A product marketed as angled but functionally providing a perpendicular grip could still be treated as vertical. Stick with well-known designs that have established ATF approval, and remember that ATF interpretations can shift.
How to Register Before Adding a Vertical Foregrip
If your pistol is under 26 inches and you want a vertical foregrip, you need ATF approval before the modification. The path depends on whether you’re doing the work yourself or buying one already built.
Making Your Own: Form 1
Installing the foregrip yourself counts as “making” an NFA firearm. File an ATF Form 1 (Application to Make and Register a Firearm) through the eForms system.4Bureau of Alcohol, Tobacco, Firearms and Explosives. eForms Applications You’ll submit fingerprints, a photograph, and go through a background check. The ATF checks whether you’re prohibited from possessing firearms under federal, state, or local law, and whether AOW possession is legal in your state.1Bureau of Alcohol, Tobacco, Firearms and Explosives. Adding a Vertical Fore Grip to a Handgun
Do not install the grip until the Form 1 comes back approved. Approval can take weeks to several months. Installing early is treated the same as never registering.
Buying One Already Made: Form 4
Buying a pistol that already has a vertical foregrip from a licensed dealer goes through an ATF Form 4 (Application for Tax Paid Transfer and Registration of a Firearm).5Bureau of Alcohol, Tobacco, Firearms and Explosives. National Firearms Act Handbook – Section 9.4.2 The dealer handles most of the paperwork, but you’ll still submit fingerprints, a photograph, and pass a background check.
The Tax
The tax to make or transfer an AOW is currently $0. The statute imposes a $200 tax only on machineguns and destructive devices; the other NFA categories, including AOWs, carry no tax.6Office of the Law Revision Counsel. 26 USC 5811 – Transfer Tax7Office of the Law Revision Counsel. 26 USC 5821 – Making Tax Older ATF publications and web guides still reference a $200 making tax or a $5 transfer tax; those reflected prior law. The paperwork and approval process remain in place even though the tax itself is zero.
Trusts and Entities
You can register as an individual, through a gun trust, or through a legal entity like a corporation. A gun trust lets multiple named individuals legally possess and use the registered firearm, which helps with family members or shooting partners, and it simplifies inheritance since NFA items can’t be handed to heirs without a transfer.
What Happens If You Skip Registration
Making or possessing an unregistered AOW is a federal felony. Making an NFA firearm without approval and possessing an unregistered NFA firearm are separate offenses.8Office of the Law Revision Counsel. 26 USC 5861 – Prohibited Acts Each carries a fine of up to $10,000, imprisonment of up to ten years, or both.9Office of the Law Revision Counsel. 26 USC 5871 – Penalties One illegal modification can expose you to both charges.1Bureau of Alcohol, Tobacco, Firearms and Explosives. Adding a Vertical Fore Grip to a Handgun With the tax now at zero, the only thing skipping registration saves is paperwork time.
A Stock Is a Different Problem
Foregrips raise AOW questions. A shoulder stock is a separate issue. Adding a stock to a pistol with a barrel under 16 inches or an overall length under 26 inches turns it into a short-barreled rifle under federal law.2Office of the Law Revision Counsel. 26 USC 5845 – Definitions SBRs are a different NFA category from AOWs, but the registration requirements are the same. Don’t assume advice about foregrips also covers stocks.
State Law Can Still Prohibit It
Federal registration doesn’t override state restrictions. Some states ban NFA items outright, including AOWs and SBRs, regardless of ATF approval. Others impose their own registration, waiting periods, or feature-based restrictions that could make a foregrip-equipped pistol illegal even after federal paperwork is complete.
Feature-triggered rules vary. Some states regulate weapons based on foregrips, pistol grips, or threaded barrels. A configuration that’s legal in one state can be a felony across a state line. Check the rules in your state, county, and city before making any modification. Federal compliance is necessary but not sufficient.