Here's a pic of the accelerator installed, with a spare below it. Also a close-up of the chamber area. The accelerator works like a turnstile, with the crescent piece pivoting around and smacking the bolt rearward under recoil.
I've fired it with and without the accelerator, and without, it takes a strong load to cycle the action...
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I like my coffee the
way I like my women...
...Cold and bitter... 
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