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I am building a super lightweight AR-15 and am looking for a flip up front sight sight gas block that will fit on .625" diameter lightweight barrels. My requirements are
1) Must be pinned, none of that clamped nonsense
2) No UTG/CAA/other airsoft junk. I don't mind paying the prices for vltor or gg&g.

This would be ideal but it only comes in a .750" diameter version:
 
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