Unlike traditional quad rail designs, the URX 3.1 incorporates short sections of M1913 Picatinny rail at its front and rear ends for mounting tactical accessories, eliminating the commonly unused sections of rail for reduced overall weight and a more comfortable grip.

M16，一支被称为开创小口径化先河的步枪，自1967年起成为美军的制式步枪后，在15个北约国家中使用，尽管早期有一些问题，但M16已经发展成足够可靠的成熟的武器系统。 目前它主要由柯尔特和FNMI生产，并被在美国和其他国家的多家大大小小的厂商生产。 半自动型AR-15是一个流行的娱乐武器由一些大型的生产商和超过一打的小作坊在制造。 全世界制造总数约8百万支。 对于M16被称为“黑枪”的原因有两种说法。

The KAC URX III & 3.1 Rail is a free floating, fully modular replacement forend for the AR-15 platform.

The URX 4 Rail is stronger and more stable than previous URX designs due to its one piece construction. It is also lighter due to its Integral Barrel Nut (IBN) system of attachment. The IBN system allows the rail itself to act as the barrel nut when torqued onto the rifle, completely eliminating the need for a separate steel barrel nut.

2017年12月31日 · Fast Shipping on top quality tactical gear and gun accessories for the AR15/M16/M4. Huge selection of scope mounts and rings, stocks, handguards and more!

Compatibility: For Tokyo Marui, Matrix, G&P and other compatible M4 / M16 Series Airsoft AEG Rifles Material: CNC Milled Aluminum Manufacturer: Knight's Armament Co. (OEM Action Army, Licensed through ZShot)

US tech data: The kac urx 4 rail is a fully modular design that utilizes the revolutionary keymod accessory mounting system. The urx 4 rail is stronger and more stable than previous urx designs due to its one piece construction. It is also lighter due to …

US tech data: The kac urx iii & 3.1 rail is a free floating, fully modular replacement forend for the ar-15 platform. Unlike traditional quad rail designs, the urx 3.1 incorporates short sections of m1913 picatinny rail at its front and rear ends for mounting tactical accessories, eliminating the commonly unused sections of rail for reduced ...

The KAC URX III & 3.1 Rail is a lightweight, free floating, modular forend designed for AR-15 platforms, with selective Picatinny rail sections for accessory mounting. It features four QD sling swivel sockets for ambidextrous sling attachment and comes in two lengths, 8" and 13.5".

Knight's Armament Co URX 3.1 13.5 Free Float Rail System for M4 / M16 Series Airsoft AEG Rifles - 13.75" / Tan MSRP: $134.99 Now: $124.99