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TSE used to carry the quad rails- no idea if they still carry utg. Although not the highest quality items the quad rail I had 3-4 years ago on an AR was solid enough for a plinker and hanging fore grips on. I am not sure how there stuff would be for holding zero on optics however.
The new made in usa pro series stuff seems to be getting rave reviews on arfcom, the super slim handguards look pretty good, and not overly expensive. Want it to replace the dumb looking stubby handguard on a JR carbine