Parts Diagrams


Lower Receiver

Lower Receiver And Buttstock Assembly

Part Description Colt Part Bushmaster Part
(1) Pistol Grip Machine Screw 64554 AN501D416-16
(2) Grip Lock Washer 90001 MS35335-61
(3) Pistol Grip 64576 9349127
(4) Safety Detent Helical Spring 61569 8448516
(5) Safety Detent 61785 8448631
(6) Lower Receiver Extension Self Locking Screw 64577 9349128
(7) Buttstock Assembly 64574 9349121
(8) Buttcap Spacer 64578 12597640
(9) Takedown Pin Detent Helical Spring 61692 8448586
(10) Takedown Pin Detent 61698 8448585
(11) Takedown Pin 61655 8448584
(12) Pivot Pin 62221 8448621
(13) Buffer Assembly 62339 8448615
(14) Action Recoil Spring 61581 8448629
(15) Bolt Catch Pin 95105 MS16562-119
(16) Bolt Catch 62301 8448628
(17) Bolt Catch Plunger 62178 8448634
(18) Bolt Catch Helical Compression Spring 62177 8448633
(19) Magazine Catch 61604 8448638
(20) Magazine Catch Button 62032 8448636
(21) Magazine Catch Helical Spring 61759 8448637
(22) Automatic Sear Pin 61615 N/A
(23) Sear 61590 N/A
(24) Selector Lever 64564 (M16) 9381367-S (AR15)
(25) Hammer And Trigger Pin 61654 8448609
(26) Hammer Assembly    
(27) Disconnector 64567(M16) 9349114-S (AR15)
(28) Disconnector 64566 N/A
(29) Trigger Assembly    
(30)Lower Receiver and Receiver Extension Assembly