![]() Cast carry handles will not have forge marks and also have cast marks like the ones pictured below. If the carry handle does not have a forge mark, it is cast aluminum, containing some inferior parts (aluminum elevation/windage knobs instead of steel for example), the knobs used to secure the handle to the upper will be poorly staked or not staked at all, and because it is cast not forged aluinum, a much weaker part. With M855, 62-grain ammo: zero at 30 meters (33 yards). ToopMount Carry Handle Rail Mount Adapter Tactical 20mm Weaver Scope Base Rail 12 Slots Scope Mount Aluminum Picatinny Rail Set for Outdoor Sport. Otherwise, the windage drum and flip-up aperture and their operation are the same as on the A2 rear sight. ![]() (square) = Brass Aluminum Forging Enterprises For Rifles With A Removable Carry Handle 6/3 Sight, and 20 Barrel: The A3 rear sight differs from the A2 in that its elevation index is marked 6/3 instead of 8/3. ![]() Here is a list of the most current I can remember at the moment: Some people like to replace the rear aperture with a tritium night sight for low light shooting conditions. There a number of founderies with their own forge mark. For people who want to change out the rear aperture in their A4 carry handle, I have outlined here how to properly do so.
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