Here is one i had listed for a while may repost it for sale later or end up keeping it cause i originally build it for myself but after building a couple 5.45x39 and a 7.62x25 upper its just taking space
these are just my personal favorites
as far as folding front sights there are many out there but i like the over priced PRI folding front sight cause its rock solid and the main reason is its very much like the HK 90s series front sights meaning center the rear circle in with the front circle ( on my other that is set up just like this i use a arms 40L BUIS for the rear and use a arms A.R.M.S. #19 DOVETAIL/STANAG THROW LEVER SCOPE MOUNT with 3x9 scope when i want to use opens i simply flip the levers and remove the scope and fold the sights up)
the rail system is a YHM LW free float rail system these cost lest than most on the market but are just as good if not better than some of the high end ones costing twice as much
btw the barrel and receiver on this are both colt
these are just my personal favorites
as far as folding front sights there are many out there but i like the over priced PRI folding front sight cause its rock solid and the main reason is its very much like the HK 90s series front sights meaning center the rear circle in with the front circle ( on my other that is set up just like this i use a arms 40L BUIS for the rear and use a arms A.R.M.S. #19 DOVETAIL/STANAG THROW LEVER SCOPE MOUNT with 3x9 scope when i want to use opens i simply flip the levers and remove the scope and fold the sights up)
the rail system is a YHM LW free float rail system these cost lest than most on the market but are just as good if not better than some of the high end ones costing twice as much
btw the barrel and receiver on this are both colt