transmission during mass production. The last version of the BMP-1 IFV (BMP-1P, Ob'yekt 765 Sp4), which was produced from 1979 to 1983, was armed with a
9M113 Konkurs system. The BMP-1P was in production by the late 1970s. Existing BMP-1s were gradually upgraded to the BMP-1P standard during the 1980s. The
Geological Society of America Bulletin. 103 (1): 1–21. Bibcode:1991GSAB..103....1P. doi:10.1130/0016-7606(1991)103<0001:oamolc>2.3.co;2. ISSN 0016-7606. Friend