| Sec. IVNFA · Registered only | C&R · IV · 107 | H & A Company set gun | H & A Company | United States | 1880–1945 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 128 | Quackenbush bicycle rifle | H.M. Quackenbush, Herkimer, NY | United States | 1896–1919 |
| Sec. IIC&R · GCA | C&R · II · 251 | Danish M1910/21 Bergmann-Bayard | Hærens Tøjhus; Hærens Rustkammer (Danish Army arsenals), Copenhagen | Denmark | 1922–1935 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 053 | Hamilton boys’ rifles, Models 7–43 | Hamilton Rifle Co., Plymouth, MI | United States | 1898–1945 |
| Sec. IVNFA · Registered only | C&R · IV · 244 | M4 Survival Rifle | Harrington & Richardson | United States | 1949–1952 |
| Sec. IVNFA · Registered only | C&R · IV · 254 | H&R T48 rifle | Harrington & Richardson | United States | 1953–1958 |
| Sec. IIC&R · GCA | C&R · II · 278 | H&R Abilene Anniversary revolver | Harrington & Richardson Arms Co. | United States | 1967–1971 |
| Sec. IIC&R · GCA | C&R · II · 279 | H&R Handy-Gun, rifled barrel, no stock | Harrington & Richardson Arms Co. | United States | 1930–1934 |
| Sec. IIC&R · GCA | C&R · II · 280 | H&R Handy-Gun with shoulder stock | Harrington & Richardson Arms Co. | United States | 1921–1934 |
| Sec. IIC&R · GCA | C&R · II · 281 | H&R Reising Model 60 rifle | Harrington & Richardson Arms Co. | United States | 1944–1946 |
| Sec. IIC&R · GCA | C&R · II · 282 | H&R Little Big Horn Trapdoor carbine | Harrington & Richardson Arms Co. | United States | 1973–1981 |
| Sec. IIC&R · GCA | C&R · II · 283 | H&R Centennial Officer's Model Springfield | Harrington & Richardson Arms Co. | United States | 1971 |
| Sec. IIC&R · GCA | C&R · II · 284 | H&R Centennial Standard Model Springfield | Harrington & Richardson Arms Co. | United States | 1971 |
| Sec. IIC&R · GCA | C&R · II · 285 | H&R Model 999, 110th year commemorative | Harrington & Richardson Arms Co. | United States | 1981 |
| Sec. IIC&R · GCA | C&R · II · 286 | H&R Self-Loading pistol | Harrington & Richardson Arms Co. | United States | 1916–1924 |
| Sec. IIC&R · GCA | C&R · II · 555 | M4 Survival Rifle | Harrington & Richardson Arms Co. | United States | 1949–1952 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 056 | H&R M4 survival rifle | Harrington & Richardson Arms Co. | United States | 1949–1952 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 054 | H&R Handy-Gun, rifled barrel | Harrington & Richardson Arms Co., Worcester, MA | United States | 1930–1934 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 055 | H&R Handy-Gun Model 122, with shoulder stock | Harrington & Richardson Arms Co., Worcester, MA | United States | 1930–1934 |
| Sec. IVNFA · Registered only | C&R · IV · 108 | H&R Handy-Gun, smoothbore | Harrington & Richardson, Worcester, MA | United States | 1921–1934 |
| Sec. IVNFA · Registered only | C&R · IV · 109 | H&R Handy-Gun with shoulder stock | Harrington & Richardson, Worcester, MA | United States | 1921–1934 |
| Sec. IVNFA · Registered only | C&R · IV · 110 | Reising Model 50 & 55 submachineguns | Harrington & Richardson, Worcester, MA | United States | 1941–1945 |
| Sec. IVNFA · Registered only | C&R · IV · 179 | Reising M50 submachinegun | Harrington & Richardson, Worcester, MA | United States | 1941–1945 |
| Sec. IIC&R · GCA | C&R · II · 287 | Hartford Model 1928 pistol | Hartford Arms & Equipment Co., Hartford, CT | United States | 1928–1932 |
| Sec. IIC&R · GCA | C&R · II · 288 | Hartford repeating pistol | Hartford Arms & Equipment Co., Hartford, CT | United States | 1929–1932 |
| Sec. IIC&R · GCA | C&R · II · 289 | Hartford single-shot target pistol | Hartford Arms & Equipment Co., Hartford, CT | United States | 1929–1932 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 057 | Heal .22 rifles | Heal Rifle Co.; Detroit Rifle Co. | United States | Before 1908 |
| Sec. IIC&R · GCA | C&R · II · 699 | Heckler & Koch PSG1 | Heckler & Koch | Germany | 1972–2014 |
| Sec. IIC&R · GCA | C&R · II · 315 | High Standard Supermatic Olympic Model 107, Olympic Commemorative | High Standard Manufacturing Co. | United States | 1972–1980 |
| Sec. IVNFA · Registered only | C&R · IV · 111 | High Standard HD silenced pistol (OSS) | High Standard Manufacturing Co. | United States | 1944–1945 |
| Sec. IIC&R · GCA | C&R · II · 277 | Hammond / Hi-Standard .45 pistol | High Standard Mfg. Co. | United States | 1938–1945 |
| Sec. IIC&R · GCA | C&R · II · 290 | Hi-Standard experimental electric free pistol, .22 | High Standard Mfg. Co. | United States | 1960–1984 |
| Sec. IIC&R · GCA | C&R · II · 291 | Hi-Standard experimental electric free pistol, .38 | High Standard Mfg. Co. | United States | 1950–1984 |
| Sec. IIC&R · GCA | C&R · II · 292 | Hi-Standard experimental ISU rapid-fire pistol | High Standard Mfg. Co. | United States | 1950–1984 |
| Sec. IIC&R · GCA | C&R · II · 293 | Hi-Standard experimental Model T-3 | High Standard Mfg. Co. | United States | 1947–1953 |
| Sec. IIC&R · GCA | C&R · II · 294 | Hi-Standard Model P 38 | High Standard Mfg. Co. | United States | 1926–1984 |
| Sec. IIC&R · GCA | C&R · II · 295 | High Standard 1980 Olympic Commemorative | High Standard Mfg. Co. | United States | 1980 |
| Sec. IIC&R · GCA | C&R · II · 296 | High Standard Crusader Commemorative pair | High Standard Mfg. Co. | United States | 1976–1984 |
| Sec. IIC&R · GCA | C&R · II · 297 | High Standard Model A | High Standard Mfg. Co. | United States | 1938–1942 |
| Sec. IIC&R · GCA | C&R · II · 298 | High Standard Model B | High Standard Mfg. Co. | United States | 1932–1942 |
| Sec. IIC&R · GCA | C&R · II · 299 | High Standard Model C | High Standard Mfg. Co. | United States | 1936–1942 |
| Sec. IIC&R · GCA | C&R · II · 300 | High Standard Model D | High Standard Mfg. Co. | United States | 1938–1942 |
| Sec. IIC&R · GCA | C&R · II · 301 | High Standard Model E | High Standard Mfg. Co. | United States | 1938–1942 |
| Sec. IIC&R · GCA | C&R · II · 302 | High Standard Model G-380 | High Standard Mfg. Co. | United States | 1947–1950 |
| Sec. IIC&R · GCA | C&R · II · 303 | High Standard Model G-B | High Standard Mfg. Co. | United States | 1949–1950 |
| Sec. IIC&R · GCA | C&R · II · 304 | High Standard Model G-D | High Standard Mfg. Co. | United States | 1949–1950 |
| Sec. IIC&R · GCA | C&R · II · 305 | High Standard Model G-E | High Standard Mfg. Co. | United States | 1949–1950 |
| Sec. IIC&R · GCA | C&R · II · 306 | High Standard Model G-O, First Model Olympic | High Standard Mfg. Co. | United States | 1949–1950 |
| Sec. IIC&R · GCA | C&R · II · 307 | High Standard Model H-A | High Standard Mfg. Co. | United States | 1940–1942 |
| Sec. IIC&R · GCA | C&R · II · 308 | High Standard Model H-B, First Model | High Standard Mfg. Co. | United States | 1940–1942 |
| Sec. IIC&R · GCA | C&R · II · 309 | High Standard Model H-B, Second Model | High Standard Mfg. Co. | United States | 1949–1953 |
| Sec. IIC&R · GCA | C&R · II · 310 | High Standard Model H-D | High Standard Mfg. Co. | United States | 1940–1942 |
| Sec. IIC&R · GCA | C&R · II · 311 | High Standard Model H-E | High Standard Mfg. Co. | United States | 1940–1942 |
| Sec. IIC&R · GCA | C&R · II · 312 | High Standard Model HD-Military | High Standard Mfg. Co. | United States | 1945–1955 |
| Sec. IIC&R · GCA | C&R · II · 313 | High Standard Model USA-HD | High Standard Mfg. Co. | United States | 1943–1946 |
| Sec. IIC&R · GCA | C&R · II · 314 | High Standard Second Model Olympic | High Standard Mfg. Co. | United States | 1951–1953 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 061 | High Standard Sentinel R-100 smoothbore, Diamond Ted edition | High Standard Mfg. Co., Hamden, CT | United States | 1955 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 058 | High Standard Model C/S smoothbore | High Standard Mfg. Co., New Haven, CT | United States | 1939–1940 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 059 | High Standard Model S smoothbore | High Standard Mfg. Co., New Haven, CT | United States | 1939–1940 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 060 | High Standard Model S smoothbore | High Standard Mfg. Co., New Haven, CT | United States | 1939–1940 |
| Sec. IIC&R · GCA | C&R · II · 316 | Holland & Holland Royal .410 double, S/N 36789 | Holland & Holland, London | United Kingdom | 1885–1975 |
| Sec. IIC&R · GCA | C&R · II · 317 | Hopkins & Allen Forehand Model 1901 revolver | Hopkins & Allen Arms Co., Norwich, CT | United States | 1901–1917 |
| Sec. IIC&R · GCA | C&R · II · 318 | Hopkins & Allen revolver, S/N G 9545 | Hopkins & Allen Arms Co., Norwich, CT | United States | 1868–1917 |
| Sec. IVNFA · Registered only | C&R · IV · 163 | Lovelace Fur Getter | Hopkins & Allen, Norwich, CT | United States | 1914–1916 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 221 | Hotchkiss 9-barrel revolving cannon | Hotchkiss et Cie | France | 1872–1918 |
| Sec. IIIAEx-NFA · Antique | C&R · IIIA · 056 | Hotchkiss Mountain Gun Model 1875 | Hotchkiss et Cie | France | 1877–1897 |
| Sec. IVNFA · Registered only | C&R · IV · 112 | Hotchkiss Model 1909 37mm field cannon, S/N IRS 3857 | Hotchkiss et Cie | France | 1909–1918 |
| Sec. IVNFA · Registered only | C&R · IV · 113 | Hotchkiss Mark I light machinegun (British) | Hotchkiss et Cie (Coventry) | United Kingdom | 1915–1918 |
| Sec. IVNFA · Registered only | C&R · IV · 114 | Hotchkiss Models 1897, 1900 & 1914 machineguns | Hotchkiss et Cie, Saint-Denis | France | 1897–1935 |
| Sec. IVNFA · Registered only | C&R · IV · 059 | Hotchkiss 25mm SA-L anti-tank gun, Mle 1934 & 1937 | Hotchkiss et Cie; APX (Puteaux) | France | 1934–1940 |
| Sec. IVNFA · Registered only | C&R · IV · 017 | Benét–Mercié machine rifle, Model 1909 | Hotchkiss et Cie; Springfield Armory; Colt | United States | 1909–1918 |
| Sec. IIC&R · GCA | C&R · II · 337 | L.C. Smith shotguns, 1899–1971 | Hunter Arms Co., Fulton, NY; Marlin Firearms Co. | United States | 1899–1971 |
| Sec. IIC&R · GCA | C&R · II · 339 | Husqvarna m/40 (Swedish Lahti) | Husqvarna Vapenfabrik | Sweden | Before 1968 |
| Sec. IIIEx-NFA · C&R · GCA | C&R · III · 152 | Lahti m/40, with holster stock | Husqvarna Vapenfabrik | Sweden | 1940–1946 |
| Sec. IVNFA · Registered only | C&R · IV · 213 | Kpist m/37-39 | Husqvarna Vapenfabriks AB | Sweden | Before 1946 |