The common types of rail systems for firearms are the dovetail rail, (including the Soviet variant known as the Warsaw Pact rail), the Weaver rail, the Picatinny rail (also known as the MIL-STD-1913 or STANAG 2324 rail), the NATO Accessory Rail (also known as the STANAG 4694 rail), and newer "negative space" systems such as the VLTOR KeyMod and the Magpul M-LOK. Airsoft and Paintball clone weapons will also likely have rails. Civilian clone Rifles are the largest adapters, while the Crossbows, Hunting Rifles, shot guns and Handguns have started to come from the factory with rail sections ether attached and/or made structurally as part of the actual Firearm.
HMGs have started to include and use rail sections and options for attachments of optics. Police and Military style firearms may include Pistols, PDWs, Carbines, Rifles, Submachine guns, Light Machine Guns, and Heavy machine guns.
Most modern military and civilian semi-automatic Firearm have rails that may replace original parts.
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.
No clocking needed to align barrel nut and gas tube.Hard coat anodized, black per MIL-A-8625 Type III Class 2.The VLTOR Freedom Rail features the KeyMod mounting system to accommodate all KeyMod and KeyMod-compatible accessories. The barrel nut and all necessary hardware for installation is included with each handguard. It is offered in various popular lengths, and is very quick and easy to install. The Freedom Rail provides a forend that has an excellent strength-to-weight ratio. The Freedom Rail is VLTOR’s first standalone AR15 handguard.
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