This rail grabber must fully rest on the RAS in order to retain zero. The Insight rail grabber is used to install the AN/ PEQ-2A and AN/PAQ-4B/C. NOTE: The bottom rail will not retain zero.Ī. Details specific to each rail grabber are outlined in the following paragraphs. A one-time retightening of the rail grabber and accessory is recommended after the first three rounds are fired to fully seat both. If the accessory and rail grabber is reinstalled on a different notch, or the rail grabber is separated from the accessory, they must be rezeroed. Once zeroed the rail grabbers can be removed from the weapon and will retain zero as long as the rail grabber is not separated from the accessory and is remounted on the exact same notch it was zeroed on. Both rail grabbers attach accessories on the upper receiver and on all four sides of the RAS. Each rail grabber has proven its ability to retain zero when installed and tightened properly. The Insight rail grabber (Figure 2-18) and the Picatinny rail grabber (Figure 2-20, page 2-14) were designed to mount accessories onto the M16A4 and M4-series weapons.
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