This is a Law tactical folding stock adapter, installed on a CZ Scorpion adapter with a Tailhook brace.
Used but not abused.
Make a reasonable offer if my pricing is out of line, the current gen law folder sells for over $200 alone, the tailhook for $140, and the CZ AR buffer tube adapter for roughly $50 or so. I don't think I'm too far off.

Out of town from June 15-22, so can't ship during that time.