With equal and even more use due to additional novelty items is the AR-15. The firearm often associated with, and that has benefited from rails is the M4 Carbine & M16 family of later models/variants -A2 -A3 & -A4. Original rails were a raised metal strip with the sides under cut, less standardized than the dovetail design, to allow hardware to slide on and be secured by means of compression only. Rails as a term has evolved to cover both the actual rail pieces and the styles of handguards (or forearms) that are made with rails as the external surfaces.
Tactical usage and Shooting sports have both benefited from the extra options provided. Along with the ability to switch different items at different placements due to varying eye reliefs on gun sights, scopes & optics. An advantage with the multiple rail slots is the moveable positions to adjust for optimal placement of each item for each different user. An example of just a few options that may be used depending on a mission's need for the M4 is SOPMOD, amongst many other accessories like sling attachment points (which may be ether ring, loop and/or quick detach mounts using push button style hardware) to name just a few of the many options. Rail systems on firearms are straight mounting brackets (usually made of strips of metal or polymer) on the gun's receiver, handguard or fore-end stock to allow sliding/variable-position attachment of optical sights and accessories such as tactical lights, laser sights, vertical/angled foregrips and bipods. To learn more, visit M4 carbine with a Picatinny rail system on the upper receiver and 4 sided handguard, showing a few possible accessory options such as a Grip Pod a type of Vertical forward grip, and an M68 CCO sight ***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. Tighten all screws (clockwise) until firmly secured (30 in-lbs) For a better, more secured hold, use blue thread locking compound on mounting screw thread only.
BCMGUNFIGHTER KEYMOD RAIL SECTION INSTALL
Select high or low position for the 1913 rail section and install the screws.With the mounting screws location selected and the screws loosened, locate the desire KeyMod™ placement on the rail system, install and slide forward until it travels no further.Note: mounting screws and recoil lug screw placement will vary, depending on mount placement, left or right hand side of the rail. Of the six mounting position holes on the mount, select the desired holes for all three screws.With supplied Torx™ wrench, loosen (counter clockwise) and remove the two mounting screws and the one recoil lug screw (reverse thread).Ensure the weapon system is unloaded and clear, prior to performing any maintenance.Intently designed to be low-profile and snag-free Designed to mount on the 3 or 9 o'clock rail positions.Multiple mounting holes for ideal placement.Fits most common 1913-rail pistol/weapon light systems.Optional high and low mounting position for the 1913 rail section.Fully ambidextrous: made to mount flush or cantilever off either the left or right side of the rail system.
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