I'll put the details together in the next few days and post them here. I thought I had a good diagram of it on my computer but when I looked, it was a previous design which didn't work quite so well, so I'll have to start drawing from scratch. How it works is simple enough with a clear drawing, but without one could be a bit like a Chinese string puzzle.
Yes, the rifle in the photo is a re-barrelled Sako AI.
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