The Brownells licensed manufacturer list (a couple of months old, others may have been added).
If the manufacturer isn't on the list (or the updated one), you're SOL.
Factory Number Factory Name DDTC Registered ( Yes )
# 006 XS SIGHT SYSTEMS, INC. Yes
# 019 ADVANCED TECHNOLOGY, INT Yes
# 02U CAVALRY ARMS CORP. Yes
# 02W JARD, INC. Yes
# 03P ARDEL ENGINEERING & MFG., INC. Yes
# 03Q FULTON ARMORY/DIV MCKEE INC. Yes
# 03Y MAGPUL INDUSTRIES CORP Yes
# 062 ARMALITE, INC. Yes
# 064 ALTAMONT CO. Yes
# 06I ARMOR ACCESSORIES Yes
# 071 BUFFER TECHNOLOGIES Yes
# 078*BROWNELLS*GUN PARTS Yes
# 079*BROWNELLS*SHOP EQUIPMENT Yes
# 07A BERETTA USA Yes
# 080*BROWNELLS, INC. Yes
# 081*BROWNELLS, BEDDING COMPOUND Yes
# 082*BROWNELLS*BLUING & PLATING Yes
# 083*BROWNELLS*GENERAL CHEMICALS Yes
# 084*BROWNELLS*INC. Yes
# 087 ED BROWN PRODUCTS, INC. Yes
# 08M DANIEL DEFENSE, INC. Yes
# 08Q TACTICAL SOLUTIONS, LLC Yes
# 092 PEARCE GRIP, INC. Yes
# 093 BADGER ORDNANCE Yes
# 10U CAVALRY ARMS CORP. Yes
# 11M SMALL ARMS MANUFACTURING CO. Yes
# 124 LES BAER CUSTOM, INC. Yes
# 129 BRILEY PISTOL DIVISION Yes
# 12V FREED DESIGNS INC/X-GRIPS Yes
# 12X MIDWEST INDUSTRIES, INC. Yes
# 13N VLTOR WEAPON SYSTEMS Yes
# 149 BROWNING ARMS CO. (PARTS) Yes
# 14L ENIDINE, INC. Yes
# 150 BROWNING ARMS CO. (ACCY.) Yes
# 159 CHOATE MACHINE & TOOL CO., INC Yes
# 15C TAPCO WEAPONS ACCESSORIES Yes
# 15Z WARREN TACTICAL SERIES Yes
# 160 COLT MANUFACTURING CO., INC. Yes
# 168 CASPIAN ARMS, LTD. Yes
# 16B COLT DEFENSE LLC Yes
# 199 PARA-ORDNANCE Yes
# 19B LASER DEVICES, INC. Yes
# 19U SOG ARMORY Yes
# 19W DAWSON PRECISION Yes
# 206 CYLINDER & SLIDE Yes
# 207 CHIP MCCORMICK CORP. Yes
# 20C MAGNUM RESEARCH Yes
# 20D DOUBLE STAR Yes
# 20U COMMAND ARMS ACCESSORIES (CAA) Yes
# 210 COSMOS ENTERPRISES, INC. Yes
# 21O BLACK DOG MACHINE LLC Yes
# 21U NORDIC COMPONENTS Yes
# 22G NIGHTHAWK CUSTOM Yes
# 231 DPMS FIREARMS LLC Yes
# 23A DPMS FIREARMS LLC Yes
# 23B DPMS FIREARMS LLC Yes
# 23X CMMG Yes
# 23Y CMMG Yes
# 23Z CMMG Yes
# 25A RSR GROUP, INC Yes
# 25C KIMBER MFG. Yes
# 264 DESPERADO SUPPLY CO. Yes
# 26Y MATECH Yes
# 27D CHIP MCCORMICK CUSTOM, LLC. Yes
# 27R RED, WHITE, & BLUE, LLC. Yes
# 28U UCT ARMS, LLC Yes
# 292 ENTREPRISE ARMS, INC. Yes
# 29H BUSHMASTER FIREARMS INT.LLC. Yes
# 29J TKS ENGINEERING Yes
# 29L SURGEON RIFLES Yes
# 29W TANGODOWN Yes
# 301 BENELLI U.S.A. Yes
# 319 FORSTER PRODUCTS, INC. Yes
# 31A FORSTER PRODUCTS, INC. Yes
# 341 NUMRICH GUN PARTS CORPORATION Yes
# 359 DAKOTA ARMS Yes
# 371 GREEN MOUNTAIN Yes
# 387 KIMBER MFG. Yes
# 38C EAI HOLDING, INC. Yes
# 393 H-S PRECISION, INC. Yes
# 394 HEINIE SPECIALTY PRODUCTS Yes
# 408 HOGUE INC. Yes
# 430 HIGH STANDARD MFG. CO. Yes
# 43A INTERARMS Yes
# 43B AMT/HIGH STANDARD Yes
# 448 S.S.I. INC. Yes
# 452 J P ENTERPRISES, INC. Yes
# 486 KRASNE'S INC. Yes
# 504 OPS, INC. Yes
# 550 MARLIN FIREARMS COMPANY Yes
# 55A MARLIN FIREARMS COMPANY Yes
# 579 MARBLE'S OUTDOORS Yes
# 593 BUSHNELL OUTDOORS PRODUCTS Yes
# 620 METALFORM CO., INC. Yes
# 625 MEC-GAR USA, INC. Yes
# 631 MOSSBERG SERVICE CENTER Yes
# 633 TAYLOR'S & CO., INC. Yes
# 635 NORGON, L.L.C. Yes
# 654 NOWLIN MFG. Yes
# 661 NEW ENGLAND CUSTOM GUN SERVICE Yes
# 687 PRO MAG Yes
# 702 BROWNELLS/PEACE RIVER ARMS Yes
# 714 PRECISION REFLEX, INC. Yes
# 739 ROCK RIVER ARMS INC. Yes
# 746 RANCH PRODUCTS Yes
# 747 ATK, RCBS Yes
# 767 REMINGTON ARMS INC. Yes
# 768 REMINGTON ARMS INC. Yes
# 780 STURM RUGER & CO. INC. Yes
# 787 SHILEN, INC. Yes
# 78B STURM RUGER & CO. INC. Yes
# 791 STI INTERNATIONAL Yes
# 795 OLYMPIC ARMS,INC. Yes
# 800 SCATTERGUN TECHNOLOGY Yes
# 801 SHILEN, INC. Yes
# 817 SPRINGFIELD ARMORY, INC. Yes
# 834 STURM RUGER & CO.,INC. Yes
# 840 SUPERIOR SHOOTING SYSTEMS, INC Yes
# 842 GENESIS MILLWORKS Yes
# 851 SMITH ENTERPRISE, INC. Yes
# 855 SAVAGE ARMS Yes
# 892 TRIJICON INC. Yes
# 910 USRAC/WINCHESTER Yes
# 913 BERETTA USA Yes
# 91A BERETTA USA Yes
# 91B BERETTA USA Yes
# 91C BERETTA USA Yes
# 930 VOLQUARTSEN CUSTOM LTD. Yes
# 940 SMITH & WESSON Yes
# 950 LOTHAR WALTHER PREC. TOOL Yes
# 955 ATK Yes
# 962 WILLIAMS GUN SIGHT CO. Yes
# 965 WILSON COMBAT Yes
# 969 W.C. WOLFF COMPANY Yes
# 983 THE WILSON ARMS CO. Yes
# 993 Z-M HIGH PERFORMANCE SYSTEMS Yes
# B25 ED BROWN CUSTOM, INC. Yes
# B30 BENELLI USA Yes
# B33*BROWNELLS*MANUFACTURING Yes
# F0D DOUBLE STAR Yes
# F24 LES BAER CUSTOM, INC. Yes
# F25 WILSON TACTICAL Yes
# F2U CAVALRY ARMS CORP. Yes
# F31 DPMS FIREARMS LLC Yes
# F34 STURM, RUGER & CO., INC Yes
# F39 ROCK RIVER ARMS INC. Yes
# F3Q FULTON ARMORY Yes
# F43 HIGH STANDARD MANUFACTURING Yes
# F59 DAKOTA ARMS Yes
# F61 BUSHMASTER FIREARMS INT.LLC. Yes
# F62 TKS ENGINEERING Yes
# F63 SURGEON RIFLES Yes
# F65 MONTANA RIFLE COMPANY Yes
# F68 CASPIAN ARMS, LTD. Yes
# F69 ARMALITE, INC. Yes
# F72 WILSON COMBAT Yes
# F77 J P ENTERPRISES, INC. Yes
# F91 STI INTERNATIONAL Yes
# K48 KRASNE'S INC. Yes
# S35 SMITH ENTERPRISES Yes
# T26 TRIJICON INC. Yes
# W06 W.C. WOLFF COMPANY Yes
