Original sentence: The BMP-1's gun is unable to penetrate the front armor of modern NATO MBTs such as the US M1A1 Abrams, the British Challenger 2 or the German Leopard 2 but it has been claimed that it can penetrate the side armor of these tanks in some areas.. On the ranges the PG-9 proved capable of hitting  tall targets at a range of , while its maximum direct fire range was , reduced to  at night due to the limitations of the night vision system.Under battlefield conditions it has a maximum effective range of
Edited sentence: The BMP-1's gun is unable to penetrate the front armor of modern NATO MBTs such as the US M1A1 Abrams, the British Challenger 2 or the German Leopard 2 but it has been claimed that it can penetrate the side armor of these tanks in some areas.. Under battlefield conditions it has a maximum effective range of