Official ATF Regs on Inglis Browning Shoulder Stock
SECTION III: Weapons Removed From The NFA As Collector's Items And Classified As Curios Or Relics Under The GCA
The Bureau has determined that by reason of the date of their manufacture, value, design and other characteristics, the following firearms are primarily collector's items and are not likely to be used as weapons and, therefore, are excluded from the provisions of the National Firearms Act.
Further, the Bureau has determined that such firearms are also curios or relics as defined in 27 CFR 178.11. Thus, licensed collectors may acquire, hold or dispose to them as curios or relics subject to the provisions of 18 U.S.C. Chapter 44 and 27 CFR Part 178. They are still "firearms" as defined in 18 U.S.C. Chapter 44.
Any military bolt action or semiautomatic rifle mfd. prior to 1946 and accompanied by a "cup type" grenade launcher designed for the specific rifle. Belgian, Pre-war mfd. Hi Power pistols, in cal. 9mm having tangent sights graduated to 500 meters, slotted for shoulder stock, having S/Ns of less than 47,000 without letter prefixes or suffixes and accompanied by original Belgian mfd. detachable wooden flat board type shoulder stocks.
Beretta, model 1918/1930, semiautomatic carbine, cal. 9mm, having a barrel length of 12.5" and a magazine capacity of 25 rounds.
Beretta, model 1923, semiautomatic pistol, in cal. 9mm Kurz (.380), accompanied by original Italian detachable leather and metal holster/shoulder stock.
Bergmann-Bayard, model 1908, Pistol, 9mm Bergmann-Bayard with shoulder stock and 4" barrel.
Bergmann, Mars model 1903, self loading pistol, w/accompanying shoulder stock.
British PIAT (Projector, Infantry, Anti-tank).
Browning, model 1903, Pistol, 9mm Browning Long, with shoulder stock and 5" barrel.
Browning Hi power pistols, 9mm having tangent sights graduated to 500 meters, slotted for shoulder stock, having S/Ns less than T200,000 etched vertically on the right side of slide, barrel or frame and bearing crest of Emirates of Muscat & Oman, or mirror image of such crest, accompanied by original detachable wooden flat board shoulder stocks.
Canadian, Inglis No. 1, Chinese Contract, Hi Power pistols, cal. 9mm parabellum, having a tangent rear sight adjustable from 50 to 500 meters, slotted for shoulder stock, and having the letters C in the S/N and accompanied by original Canadian mfd. detachable wooden holster/shoulder stock.