The exact location of the item in the sequencer

Hello everybody! There is an animation of reloading weapons made in a third-party program. How do I make sure that the position of the weapon in the sequencer is exactly the same as in the program? Manually placing weapons in the sequencer gives an inaccurate result, maybe there is a way to make it faster and easier? The position of the weapon and the projectile must be exactly the same in the sequencer.