Have you replaced any parts of the gas system, such as the regulator or the gas pipe?
We recommend only using the gas regulator and pipe that came supplied with your Bangalore Broadside. Together these will ensure that the gas pressure delivered to the Bangalore is optimum. This will reduce mis-fires to a minimum and ensure that you get a good, solid bang each time it fires.
Also, check your gas pipes for damage - don't forget to check the gas pips inside the Bangalore chassis. Mice and rats can sometimes chew through the pipes.
You can buy a replacement gas regulator or a complete gas system from the Bangalore Bird Scarers website.