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* All dates and serial numbers are approximate *

USRIFLECAL30M1.COM M1 Garand Components List
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MFGComponentDrawing NumberHeat LotDate RangeSerial# RangeNotes
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IHCAperatureB8868-1Type 3January/1953 to December/19564400000 - 5278245Late version. Squared ramp shoulders below aperature disk. Wide tracks (0.085 inches wide). Edges of aperture disk smoothly finished.
IHCBarrelD6535448N/AJanuary/1953 to November/19564400000 - 5278245Manufactured by Line Material Compay. Barrels are marked with date and "LMR". Date should be within a few months of Receiver manufacture date.
IHCBolt6528287 IHCUJanuary/1954 to December/19565000501 - 5278245Hole in bottom. "U" is heat lot, doesn not indicate Underwood manufacture.
IHCBoltD-6528287IHCUJanuary/1953 to December/19544400000 - 4660000Hole in bottom. "U" in heat lot identification, does not indicate Uderwood manufacture.
IHCBoltD6528287 IHCUJanuary/1954 to December/19565000501 - 5278245Hole in bottom. "U" is heat lot, doesn not indicate Underwood manufacture.
IHCBullet GuideB8875Type 5January/1953 to December/19564400000 - 5278245Stamped steel, wide slot. Notch 0.25 inch in radius on upper left side.
IHCButtplate AssemblyC64283Type 2January/1953 to December/19564400000 - 5278245Cap, 11.5 squares in vertical row intersecting screw hole.
IHCClip EjectorC46018N/AJanuary/1953 to December/19564400000 - 5278245parkerized
IHCClip LatchC46011Springfield 2January/1953 to December/19564400000 - 5278245Squared front end, inspector's initials("A" or "C") beside spring retaining hole on inside
IHCClip Latch PinN/AN/AJanuary/1953 to December/19564400000 - 52782453.280 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.
IHCClip Latch SpringN/AN/AJanuary/1953 to December/19564400000 - 52782450.03 inch steel wire, 5 coils, outside diameter 0.26 inch. White finish is original, Parkerized indicates refinishing.
IHCElevating PinionN/AType 4January/1953 to December/19564400000 - 5278245Postwar with 8-36NF thread, no locking bar
IHCElevation KnobN/AType 2January/1953 to December/19564400000 - 5278245Postwar, integral part of pinion, may be marked "IHC DRC".
IHCExtractorN/AN/AJanuary/1953 to December/19564400000 - 5278245Parkerized.
IHCExtractor Spring and PlungerB8886N/AJanuary/1953 to December/19564400000 - 5278245 
IHCFiring PinB8879N/AJanuary/1953 to December/19564400000 - 5278245Half round cross section.
IHCFollower and SlideN/AType 2FJanuary/1953 to December/19564400000 - 5278245Unmarked.
IHCFollower ArmB8869Type 4January/1953 to December/19564400000 - 5278245No bevel, rounded follower arm pin lugs. Unmarked.
IHCFollower Arm PinA13667Type 3January/1953 to December/19564400000 - 5278245No rebate on either end, straight shaft.
IHCFollower RodC64331Type 5January/1953 to December/19564660001 - 5793847Stamped sheet metal. Long fork plate riveted. No marking. Grooves/knurls eliminated.
IHCFront Hand GuardC64245N/AJanuary/1953 to December/19564400000 - 5278245 
IHCFront SiteB147427Type 3CJanuary/1953 to December/19564400000 - 52782450.875 inches wide at blades. Widest of all manufactured.
IHCFront Site ScrewN/AType 3January/1953 to December/19564400000 - 5278245Non-rebated head. Head may be smooth or knurled.
IHCGas CylinderD35449Type 2CJanuary/1953 to December/19564400000 - 5278245.575 - .580 inch front sight base, flat top on rear ring, unmarked. May show numbers or letters for machinist's marks.
IHCGas Cylinder LockB147426Type 3AJanuary/1953 to December/19564400000 - 5278245Front face not chamfered. Hardened, high hump with square edges. Unmarked. 1.455 inches high.
IHCGas Cylinder Lock Screw(Plug)B7310079Type 3January/1953 to December/19564400000 - 5278245Return poppet valve, cross shaped slot. Marked "IHC" or "IHC NHC".
IHCHammer5546008IHCType 2CJanuary/1954 to December/19565010001 - 5278245Drawing number on face, early hooks, no tooling hole.
IHCHammer5546008IHCType 2DJanuary/1954 to November/19565010001 - 5278245Drawing number on face, early hooks, letter stamped above drawing number, no tooling hole.
IHCHammerC-5546008 IHCType 2AJanuary/1953 to November/19544440000 - 4500000Drawing number on face, late hooks, no tooling hole.
IHCHammerIHC C5546008Type 2BJanuary/1954 to November/19564500001 - 5010000Drawing number on face, early hooks, no tooling hole.
IHCHammer PinA13668N/AJanuary/1953 to December/19564400000 - 5278245 
IHCHammer SpringB8887N/AJanuary/1952 to December/19564400000 - 527824520 coils
IHCHammer Spring HousingB8883Type 2January/1953 to December/19564400000 - 5278245 
IHCHammer Spring PlungerB8880Type 2January/1953 to December/19564400000 - 52782451.50 inches long, "wingless" head, 0.40 inches wide.
IHCHandguard ClipN/AType 3January/1953 to December/19564400000 - 5278245Stamped steel, flat profile, no groove.
IHCHandguard FerruleN/AType 2January/1953 to December/19564400000 - 5278245Lip protruding .06 inches from rear barrel hole.
IHCHandguard LinerB8893Type 4January/1953 to December/19564400000 - 5278245Unmarked. No front or rear hole. Notch is .70 inches wide by .15 inches deep.
IHCLower BandC46000Type 3January/1953 to December/19574400000 - 5278245Stamped flat profile with no groove or scallops. Unmarked.
IHCLower Band PinN/AType 2January/1953 to December/19564400000 - 5278245Roll pin.
IHCOperating Rod6535382 IHC10December/1955 to December/19565100000 - 5278245Straight bolt lug, 5/16 radius cut, flat side, marking on bottom. May have a letter marking below drawing number on late production.
IHCOperating RodD-6535382 IHC10January/1953 to December/19544400000 - 4660000Straight bolt lug, 5/16 radius cut, flat side, marking on bottom
IHCOperating RodD6535382 IHC10January/1954 to December/19555000501 - 5150000Straight bolt lug, 5/16 radius cut, flat side, marking on bottom
IHCOperating Rod Catch AssemblyC46027Type 2January/1953 to December/19564400000 - 5278245Early unmarked, later marked "B,C,F,G,H, or I". Right fork 0.10 in wide and Left fork 0.07 in wide, width at accelerator rivet 0.79 in.
IHCOperating Rod SpringSA14675/B147658N/AJanuary/1953 to December/19564400000 - 5278245Round cross section.
IHCRear Hand GuardC46024Type 2January/1953 to December/19564400000 - 5278245Operating rod clearance cut on right rear.
IHCRear Sight BaseC46001Type 2January/1953 to December/19564400000 - 5278245may be stamped "A" or "C"
IHCRear Sight CoverB8872N/AJanuary/1953 to December/19564400000 - 5278245Similar to Type 2 SA.
IHCRear Sight Lock NutN/AType 3January/1953 to December/19564400000 - 5278245Windage knob nut.
IHCReceiverD6528291-CN/AJanuary/1953 to December/19534400000 - 4660000 
IHCReceiverD6528291-DN/AJanuary/1953 to December/19534400000 - 4660000 

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