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.&