Contributed by ArmedHippie (click on images for full size).
25th year of production:
Barrel Lug: Pinned
Battle Sight on RSL: 3
Bayonet Type: Spike
Bayonet Lug: Late Non-Cutout (Originally for Rivet/no threads)
Bolt Carrier: Late Non-Cutout
Gas Tube: Two Piece
Gas Block: Cast (Round & smoothed)
Receiver Cover Takedown: Regular
Rear Sight Block: Milled
Serial Number Format: 8 digit, 25,000,0XX
S/N on Components: last 5, leading zeros
S/N on Stock: last 5, leading zeros, small font
Stock Swivel: Bottom
Trigger Group Type: Late Stamped
(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_left_whole.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_receiver.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_receiver2.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_import_stamp.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_left_front.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_stock.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_stock2.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_right_whole.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_right_center.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_right_front.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_right_gas_tube.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_right_lug.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_bottom_lug.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_bottom_receiver1.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_bottom_receiver2.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_bottom_receiver3.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_chamber.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_RSL.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_top_receiver.jpg)(http://i781.photobucket.com/albums/yy94/sks-files/chinese/DP_Changchun/25000062_trigger_group.jpg)