Maintain an M4 or M4A1 Carbine Reviews
Inspect Bolt Carrier Group
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&pageText=To inspect the bolt carrier group of the M4/M4A1 carbine for serviceability, these components must be inspected:& &label1=Bolt carrier& &label2=Bolt and the cam pin hole area& &label3=Firing pin retaining pin& &label4=Firing pin& &label5=Cam pin& &label6=Extractor and extractor lip& &label7=Rubber insert inside the extractor spring& &popText1=Check the bolt carrier for chips, burrs, and cracks.& &popText2=Check the bolt for cracks or fractures, especially in the cam pin hole area. Bolts that contain pits in the firing pin hole need replacing.& &popText3=Check the firing pin retaining pin for bends and excessive wear.& &popText4=Check the firing pin for bends, cracks, and blunted or sharp ends.& &popText5=Check the cam pin for cracks and chips. & &popText6=Check the extractor for chipped or broken edges in the area of the lip that engages the cartridge rim.& &popText7=Check to ensure that the rubber insert is inside the extractor spring.&
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