![](https://s.turbifycdn.com/aah/yhst-89358177361248/m16-weaver-carry-handle-rail-27.gif) | ![](https://sep.turbifycdn.com/ca/Img/trans_1x1.gif) | ![](https://s.turbifycdn.com/aah/yhst-89358177361248/m16-weaver-carry-handle-rail-28.gif)
![Click to enlarge](https://s.turbifycdn.com/aah/yhst-89358177361248/thru-mount-sighting-18.gif)
![<B>Thru-Mount Sighting](https://s.turbifycdn.com/aah/yhst-89358177361248/thru-mount-sighting-19.gif)
Thru-Mount Aperature sighting allows for use of the ACS-21 without interferring with the standard iron sights.
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