Ratnakant Chavan

I have seen this movie five times .But one thing in movie which I have not fully understood is that,the jackal conceiled his gun in white Alfa Romeo two sitter car in pipe and welded it under the car. But when he met with an accident with a another white car, he abandoned his own car under which the gun was welded and conceled. But he left with other white car. Now, the question is how and when he shifted his gun in other white car which l have did not fully understood as it as not shown in movie. Can anyone throw light on it, as shifting the gun in other car is not shown in movie.