Parts Diagrams: Lower Receiver and Buttstock Assembly 

Lower Receiver and Buttstock Assembly

(1) Grip Machine Screw
(2) Grip Lock Washer
(3) Grip
(4) Safety Detent Helical Spring
(5) Safety Detent
(6) Lower Receiver Extension Self Locking Screw
(7) Buttstock Assembly
(8) Stepped Spacer
(9) Takedown Pin Detent Helical Spring
(10) Takedown Pin Detent
(11) Takedown Pin
(12) Pivot Pin
(13) Buffer Assembly
(14) Recoil Spring
(15) Bolt Catch Pin
(16) Bolt Catch
(17) Bolt Catch Plunger
(18) Bolt Catch Helical Compression Spring
(19) Magazine Catch
(20) Magazine Catch Button
(21) Magazine Catch Helical Spring
(22) Automatic Sear Pin
(23) Sear
(24) Selector Lever
(25) Hammer And Trigger Spring
(26) Hammer Assembly
(27) Disconnector
(28) Disconnector
(29) Trigger Assembly
(30) Lower Receiver and Receiver Extension Assembly