A theft or loss of firearms must be reported to your local police as well as to ATF within 48 hours after the discovery. Licensees should notify ATF on the 24–hour, 7 days a week toll free line at 1 (888) 930-9275 and by preparing and submitting ATF Form 3310.11, Federal Firearms Licensee Firearms Inventory Theft/Loss Report.
The theft or loss of NFA firearms should also be reported to the NFA Branch immediately upon discovery. The NFA Branch can be contacted at (304) 616-4500.
[18 U.S.C. 923(g)(6); 27 CFR 478.39a and 479.141]