We have Colt Carry handles which are getting harder to find. These are perfect for clone builds but will work with any rifle that has a picatinny rail.
https://www.venturesurplus.com/products/used-colt-m4-detachable-carry-handle-iron-sight/
https://www.venturesurplus.com/products/used-colt-m4-detachable-carry-handle-iron-sight/