Maintain an M4 or M4A1 Carbine Reviews
Inspect Upper Receiver Group
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&pageText=To inspect the upper receiver group of the M4/M4A1 carbine for serviceability, these components must be inspected:&
&label1=Forward assist assembly&
&label2=Ejection port cover&
&label3=Rear sight windage and elevation knobs&
&label4=Carrying handle assembly&
&label5=Front sight assembly&
&label6=Bore and chamber&
&label7=Bolt lugs&
&label8=Slip ring&
&label9=Compensator&
&label10=Bolt guide rails&
&popText1=Check the free movement of the forward assist assembly.&
&popText2=Check for a broken or damaged ejection port cover.&
&popText3=Check the rear sight windage and elevation knobs for damage or looseness.&
&popText4=Check the carrying handle assembly for missing or damaged parts.&
&popText5=Check the front sight assembly for damage.&
&popText6=Inspect the bore and chamber for pitting or obstructions.&
&popText7=Inspect the bolt lugs for cracks and burrs.&
&popText8=Check for free movement of the slip ring.&
&popText9=Check the compensator for proper alignment.&
&popText10=Check the bolt guide rails for chips and burrs.&
