I don't have one but it looks like a Gas-lock front-sight. The gas plug with the knurled knob and the 3/8" nut holds the unit on. Not enough room for a USGI flash-hider...so it has been chopped
I blame you for this Mr Big, I have had the thought of buying one of these myself for a while..............now with all this talk here and the other thread. I am off to place the order.................LOL. The itch was to much. LOL
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