HRA | Receiver | D628291-L | N/A | January/1954 to December/1954 | 4660001 - 5793847 | |
HRA | Receiver | D628291-P | N/A | January/1954 to December/1956 | 4660001 - 5793847 | |
HRA | Receiver | D628291-Q | N/A | January/1954 to December/1956 | 4660001 - 5793847 | |
HRA | Receiver | D628291-Y | N/A | January/1954 to December/1954 | 4660001 - 5793847 | |
HRA | Safety | C46015 | Type 3F | January/1953 to December/1956 | 4660001 - 6034729 | marked "HRA" on right side, tooling hole. May show inspectors initial. |
HRA | Stacking Swivel | B8891 | N/A | January/1953 to December/1956 | 4660001 - 6034729 | |
HRA | Stacking Swivel Screw | N/A | N/A | January/1953 to December/1956 | 4660001 - 6034729 | |
HRA | Stock | D35647 | Type 3 | January/1952 to January/1954 | 4660001 - 4664000 | .81/.81 butt stock holes, 1.75 inch channel, Straight clip latch relief, .44 Ordnance Wheel on left side. |
HRA | Stock | D35647 | Type 3 | February/1954 to September/1955 | 4661000 - 5609000 | .81/.81 butt stock holes, 1.75 inch channel, Straight clip latch relief, DOD Acceptance Stamp(3/8x3/8) |
HRA | Stock | D35647 | Type 3 | June/1955 to December/1956 | 5561000 - 6034279 | .81/.81 butt stock holes, 1.75 inch channel, Straight clip latch relief, DOD Acceptance Stamp(.50x.50). |
HRA | Stock Ferrule Assembly | C40613 | Type 2C | January/1953 to December/1956 | 4660001 - 6034729 | 2 piece stamped steel/brazed construction. 0.190 inch hole at bottom of U shaped channel. |
HRA | Trigger | C46020 | Type 2 | January/1953 to December/1956 | 4660001 - 6034729 | No tooling hole. No markings. |
HRA | Trigger Guard | C7312631 | Type 2B | January/1953 to December/1956 | 4660001 - 6034729 | Stamped, tab hook. No markings. |
HRA | Trigger Housing | 6528290 HRA N | Type 1 | January/1953 to December/1956 | 4660001 - 6034729 | Cloverleaf hole, pad width 0.205 inch. May be marked with letter code. |
HRA | Trigger Pin | A13669 | N/A | January/1953 to December/1956 | 4660001 - 6034729 | |
IHC | Aperature | B8868-1 | Type 3 | January/1953 to December/1956 | 4400000 - 5278245 | Late version. Squared ramp shoulders below aperature disk. Wide tracks (0.085 inches wide). Edges of aperture disk smoothly finished. |
IHC | Barrel | D6535448 | N/A | January/1953 to November/1956 | 4400000 - 5278245 | Manufactured by Line Material Compay. Barrels are marked with date and "LMR". Date should be within a few months of Receiver manufacture date. |
IHC | Bolt | 6528287 IHC | U | January/1954 to December/1956 | 5000501 - 5278245 | Hole in bottom. "U" is heat lot, doesn not indicate Underwood manufacture. |
IHC | Bolt | D-6528287IHC | U | January/1953 to December/1954 | 4400000 - 4660000 | Hole in bottom. "U" in heat lot identification, does not indicate Uderwood manufacture. |
IHC | Bolt | D6528287 IHC | U | January/1954 to December/1956 | 5000501 - 5278245 | Hole in bottom. "U" is heat lot, doesn not indicate Underwood manufacture. |
IHC | Bullet Guide | B8875 | Type 5 | January/1953 to December/1956 | 4400000 - 5278245 | Stamped steel, wide slot. Notch 0.25 inch in radius on upper left side. |
IHC | Buttplate Assembly | C64283 | Type 2 | January/1953 to December/1956 | 4400000 - 5278245 | Cap, 11.5 squares in vertical row intersecting screw hole. |
IHC | Clip Ejector | C46018 | N/A | January/1953 to December/1956 | 4400000 - 5278245 | parkerized |
IHC | Clip Latch | C46011 | Springfield 2 | January/1953 to December/1956 | 4400000 - 5278245 | Squared front end, inspector's initials("A" or "C") beside spring retaining hole on inside |
IHC | Clip Latch Pin | N/A | N/A | January/1953 to December/1956 | 4400000 - 5278245 | 3.280 inches long,head is 0.155 inches in diameter and 0.065 inches high. Opposite end slightly rounded. Body of pin is 0.119 inches in diameter. |
IHC | Clip Latch Spring | N/A | N/A | January/1953 to December/1956 | 4400000 - 5278245 | 0.03 inch steel wire, 5 coils, outside diameter 0.26 inch. White finish is original, Parkerized indicates refinishing. |
IHC | Elevating Pinion | N/A | Type 4 | January/1953 to December/1956 | 4400000 - 5278245 | Postwar with 8-36NF thread, no locking bar |
IHC | Elevation Knob | N/A | Type 2 | January/1953 to December/1956 | 4400000 - 5278245 | Postwar, integral part of pinion, may be marked "IHC DRC". |
IHC | Extractor | N/A | N/A | January/1953 to December/1956 | 4400000 - 5278245 | Parkerized. |
IHC | Extractor Spring and Plunger | B8886 | N/A | January/1953 to December/1956 | 4400000 - 5278245 | |
IHC | Firing Pin | B8879 | N/A | January/1953 to December/1956 | 4400000 - 5278245 | Half round cross section. |
IHC | Follower and Slide | N/A | Type 2F | January/1953 to December/1956 | 4400000 - 5278245 | Unmarked. |
IHC | Follower Arm | B8869 | Type 4 | January/1953 to December/1956 | 4400000 - 5278245 | No bevel, rounded follower arm pin lugs. Unmarked. |
IHC | Follower Arm Pin | A13667 | Type 3 | January/1953 to December/1956 | 4400000 - 5278245 | No rebate on either end, straight shaft. |
IHC | Follower Rod | C64331 | Type 5 | January/1953 to December/1956 | 4660001 - 5793847 | Stamped sheet metal. Long fork plate riveted. No marking. Grooves/knurls eliminated. |
IHC | Front Hand Guard | C64245 | N/A | January/1953 to December/1956 | 4400000 - 5278245 | |
IHC | Front Site | B147427 | Type 3C | January/1953 to December/1956 | 4400000 - 5278245 | 0.875 inches wide at blades. Widest of all manufactured. |
IHC | Front Site Screw | N/A | Type 3 | January/1953 to December/1956 | 4400000 - 5278245 | Non-rebated head. Head may be smooth or knurled. |
IHC | Gas Cylinder | D35449 | Type 2C | January/1953 to December/1956 | 4400000 - 5278245 | .575 - .580 inch front sight base, flat top on rear ring, unmarked. May show numbers or letters for machinist's marks. |
IHC | Gas Cylinder Lock | B147426 | Type 3A | January/1953 to December/1956 | 4400000 - 5278245 | Front face not chamfered. Hardened, high hump with square edges. Unmarked. 1.455 inches high. |
IHC | Gas Cylinder Lock Screw(Plug) | B7310079 | Type 3 | January/1953 to December/1956 | 4400000 - 5278245 | Return poppet valve, cross shaped slot. Marked "IHC" or "IHC NHC". |
IHC | Hammer | 5546008IHC | Type 2C | January/1954 to December/1956 | 5010001 - 5278245 | Drawing number on face, early hooks, no tooling hole. |
IHC | Hammer | 5546008IHC | Type 2D | January/1954 to November/1956 | 5010001 - 5278245 | Drawing number on face, early hooks, letter stamped above drawing number, no tooling hole. |
IHC | Hammer | C-5546008 IHC | Type 2A | January/1953 to November/1954 | 4440000 - 4500000 | Drawing number on face, late hooks, no tooling hole. |
IHC | Hammer | IHC C5546008 | Type 2B | January/1954 to November/1956 | 4500001 - 5010000 | Drawing number on face, early hooks, no tooling hole. |
IHC | Hammer Pin | A13668 | N/A | January/1953 to December/1956 | 4400000 - 5278245 | |
IHC | Hammer Spring | B8887 | N/A | January/1952 to December/1956 | 4400000 - 5278245 | 20 coils |
IHC | Hammer Spring Housing | B8883 | Type 2 | January/1953 to December/1956 | 4400000 - 5278245 | |
IHC | Hammer Spring Plunger | B8880 | Type 2 | January/1953 to December/1956 | 4400000 - 5278245 | 1.50 inches long, "wingless" head, 0.40 inches wide. |
IHC | Handguard Clip | N/A | Type 3 | January/1953 to December/1956 | 4400000 - 5278245 | Stamped steel, flat profile, no groove. |