In the mid-1970s, after analysis of the use of light AFVs during the Yom Kippur, Angolan and Vietnam wars, a modernization program was begun that resulted in the BMP-1P (Ob'yekt 765 Sp4). The main changes were the replacement of the largely ineffective 9M14M "Malyutka" ATGM with the more reliable, longer range and more powerful 9P135M or 9P135M-1 ATGM launcher. It was located on a special pintle mount on top of the turret roof, that could fire the SACLOS guided 9M113 and 9M113M "Konkurs-M" ATGMs, which increased armor penetration to and had an extended range of . The 9P135M-1 launcher was also capable of firing 9M111 and 9M111-2 "Fagot" ATGMs. The "Malyutka" loading hatch was usually welded shut and the mounting bracket was removed. The new missiles were somewhat difficult to use since the gunner had to stand in his open hatch, exposing himself to hostile fire. It is possible to detach the 9P135M(1) ATGM launcher from the turret and use it from the ground. The BMP-1P was equipped with neutron weapon protection covering and a new fire-extinguishing system for protection against napalm. Later BMP-1Ps were fitted with an array of six 902V "Tucha" calibre smoke grenade launchers at the rear of the turret. Some were also equipped with the track-width KMT-10 mine plow. The BMP-1P replaced the BMP-1 in production in 1979 and many BMP-1s were upgraded to the new standard during the 1980s.