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I have a rifle with the old Colt Optics/Hakko 4x rifle scope mounted directly on the handle. I can shoot 1.5" groups@100 yds. with it all day. The problem with the high mounted scope is that at shorter distances the accuracy of the scope crosshair position quickly declines. The sight picture will be considerably higher at 50 yds. or closer.. The advantage as I see it, with the handle mount is that it allows unrestricted access to the standard battle sights below so they can be used and sighted for anything under and including 50 yds. A scope mounted on the low mount Picatinny flat top receiver system is superior but I dislike those angled side sights that owners use as back up sight. The handle mount is indeed a compromise but it can be made to work satisfactorily. .
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The only optics that belong in the carry handle are ACOGs. Everything else will be way too high, and damn near unusable for accurate shooting.
I have a rifle with the old Colt Optics/Hakko 4x rifle scope mounted directly on the handle. I can shoot 1.5" groups@100 yds. with it all day. The problem with the high mounted scope is that at
shorter distances the accuracy of the scope crosshair position quickly declines. The sight picture will be considerably higher at 50 yds. or closer.. The advantage as I see it, with the handle mount is that it allows unrestricted access to the standard battle sights below so they can be used and sighted for anything under and including 50 yds. A scope mounted on the low mount Picatinny flat top receiver system is superior but I dislike those angled side sights that owners use as back up sight. The handle mount is indeed a compromise but it can be made to work satisfactorily. .
Huh??? Regardless of scope position, once it is sighted in, point of impact remains the same throughout the ballistic range. For a 223/556 carbine with an optic mounted on top of the carrying handle, its aiming point is more than 3.5" above the bore line so the offset point between 25 yds and less will be somewhere in the same neighborhood of 3.5".
Also, it is not the scope position so high that one can't shoot accurately, it is the lack of consistent cheek weld when the shooter has to 'crane' his neck to see the optic.
Back to the original question, OP, there is no such thing as super low profile optic for carrying handle. The original AR wasn't designed as optic-friendly platform, thus the change to A3/4 upper with detachable carrying handle/rear sight. Your best bet is to yank out the A2 receiver and drop in an flat top for about 100 bux (with reclaimed port door/fw assist from the A2) and be done.