Rail Grabbers And Miles Training Extender

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. Each rail grabber has proven its ability to retain zero when installed and tightened properly. Both rail grabbers attach accessories on the upper receiver and on all four sides of the RAS. 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. 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. A one-time retightening of the rail grabber and accessory is recommended after the first three rounds are fired to fully seat both. Details specific to each rail grabber are outlined in the following paragraphs.

NOTE: The bottom rail will not retain zero.

a. Insight Rail Grabber (Figure 2-18). The Insight rail grabber is used to install the AN/PEQ-2A and AN/PAQ-4B/C. This rail grabber must fully rest on the RAS in order to retain zero. The locking clamp (1) must grasp the RAS, and the screw that tightens the rail grabber must be tightened with a field tool such as a multipurpose tool.

(1) Both of the holes (2) located in the top of the rail grabber can be used to mount accessories, but the hole closest to the muzzle must be used. This ensures the maj ority of the rail grabber is supporting the accessory being mounted to prevent damage to the accessory.

(2) The rail grabber can be mounted where the tightening screw (3) is on either the left or right side (when top mounted) or top or bottom (when left side mounted) so it does not interfere with the operation of the weapon.

(3) Unless command-directed, all devices in a unit do not have to be mounted in the same location as long as the individual users record or mark the mounting location on their weapon to avoid unnecessary rezeroing. (Some examples of marking techniques are paint markers and grease pencils.)

(4) Even if the rail grabber is resting entirely on the RAS, accessories should not make contact with the front sight assembly or the collar of the barrel. The vibrations that occur during firing will interfere with the rail grabber's and accessory's zero retention capabilities.

Zeroing Mechanism For Laser With Gun
Figure 2-18. Insight rail grabber.

b. MILES Training Extender for the Insight Rail Grabber (Figure 2-19). The purpose of the training extender is to elevate the accessory above the MILES laser during force-on-force training. The extender is installed by using the thumbscrew (1) to hand tighten the extender into the mounting hole closest to the muzzle on the Insight rail grabber. Once the extender is installed, the accessory is installed on top of the extender and tightened. The training extender is only used when the Insight rail grabber is top mounted.

NOTE: TheAN/PEQ-2A and AN/PAQ-4B/C must be zeroed before and after using the MILES training extender.

Figure 2-19. Insight rail grabber MILES training extender.

c. Picatinny Rail Grabber (Figure 2-20, page 2-14). The Picatinny rail grabber must fully rest on the RAS in order to retain zero. The locking clamp must grasp the RAS and the torque-limiting knob (1) that tightens the rail grabber must be hand tightened until it clicks two times.

(1) Both of the holes located in the top of the rail grabber (1) can be used to mount accessories, but the hole closest to the muzzle must be used. This ensures the maj ority of the rail grabber is supporting the accessory being mounted to prevent damage to the accessory. It also allows the torque-limiting knob (2) to be mounted on either the left or right side (when top mounted) or top or bottom (when side mounted) to ensure the torque-limiting knob does not interfere with the operation of the weapon.

(2) Unless command-directed, all devices in a unit do not have to be mounted in the same location as long as the individual users record or mark the mounting location on their weapon to avoid unnecessary zeroing. (Some examples of marking techniques are paint markers and grease pencils.)

(3) Even if the rail grabber is resting entirely on the RAS, accessories should not make contact with the front sight assembly or the collar of the barrel. The vibrations that occur during firing will interfere with the rail grabber's and accessory's zero retention capabilities.

Figure 2-20. Picatinny rail grabber. 2-4. BACKUP IRON SIGHT

The backup iron sight (BIS) (Figure 2-21) is a semi-permanent flip up iron sight, equipped with a rail-grabbing base. It is intended to remain on the MWS while the M68 close combat optic (CCO) reflex sight is used as the primary means of day fire control. If the M68 fails, the prezeroed BIS can be flipped up and used to continue the mission. The BIS should only be removed by the armorer and remains on the MWS at all the times unless the carrying handle/sight is installed.

a. The BIS is installed by the armorer on the first notch of the integrated rail nearest the charging handle. The flip-up sight collapses towards the firer out of the way and can be used while the M68 is mounted. The BIS provides a backup capability effective out to at least 600 meters and can be installed on the M16A4 and M4-series weapons. Before installing the BIS, remove all rail covers/heat shields from the top except one 4-, 5-, or 6-rib shield. The remaining rail cover/heat shield can be positioned to accommodate accessories and protect the nonfiring hand when the barrel is hot.

Figure 2-20. Picatinny rail grabber. 2-4. BACKUP IRON SIGHT

The backup iron sight (BIS) (Figure 2-21) is a semi-permanent flip up iron sight, equipped with a rail-grabbing base. It is intended to remain on the MWS while the M68 close combat optic (CCO) reflex sight is used as the primary means of day fire control. If the M68 fails, the prezeroed BIS can be flipped up and used to continue the mission. The BIS should only be removed by the armorer and remains on the MWS at all the times unless the carrying handle/sight is installed.

a. The BIS is installed by the armorer on the first notch of the integrated rail nearest the charging handle. The flip-up sight collapses towards the firer out of the way and can be used while the M68 is mounted. The BIS provides a backup capability effective out to at least 600 meters and can be installed on the M16A4 and M4-series weapons. Before installing the BIS, remove all rail covers/heat shields from the top except one 4-, 5-, or 6-rib shield. The remaining rail cover/heat shield can be positioned to accommodate accessories and protect the nonfiring hand when the barrel is hot.

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