xdave

It's a G&P Masterkey, single shot which uses the same magazines as the other G&P shotguns. The base gun and is this one (the shotgun is available separately): https://www.youtube.com/watch?v=A2oqyfsU7LM Sadly not, just a normal door with a big lock.

I've been building my collection over about ten years now, but up till a few weeks ago most of them were stacked in cupboards with a lack of space to display them. An opportunity to get hold of some peg board from a shop refit came along so I ripped out the lot and remodelled: I'm waiting on some more of the single hooks to arrive - with the ends cut off and carefully filed to a rounded point they are an excellent way of mounting handguns without scratching the inner barrels.

I've had a CAM870 with the same issue out of the box, but unlike yours only with the trigger assembly fitted. I'll share my solution in case it brings you any help. I had to gently file down the angle shown below on the rear of the cradle arm that engages with the trigger assembly. I had to round it very slightly on the outer edge to get it to release smoothly when each shell was loaded and the arm was in its furthermost front position as it was just catching and preventing it from resetting properly. For completeness here is the opposite mating part linked to the action bar lock