Just an update, i stripped the whole thing down and it was dry and dirty i gave it a dam good clean and a good oiling. Anyway after re assembling it felt smoother and i was quite confident that was the problem sorted.
Today i took it on the shoot and first shots no problems, second drive got on my peg and there were pegs in front of me, so i became a back gun. anyway the guns in front missed their target and i took aim and fired first cartridge bang (missed), eject, reload and nothing No click from the fireing pin, ejected cartridge manually, pulled trigger, click went the pin, reloade