I think I found my problem on that - I went online and watched a video of how to install the primers and I was not being 'forceful' enough.. I was just trying to push them in, in the video he is banging on them.. I was also doing this on the tailgate of the truck, on a slope - not the ideal conditions LOL

Out of all the adapters that came with the kit, I did actually manage to get 1 of them in the gun and get it locked closed.. I emailed the place i bought them and asked.

thanks
b