Requirements: This URX 3.1 rail is compatible with any standard gas
system length but does require the use of a low profile gas block.
Disassembly of the rifle's gas system and removal of the factory barrel
nut will be necessary. This forend uses a proprietary barrel nut that
MUST be installed using a KAC URX Barrel Nut Wrench. For AR-15/SR-15
based platforms only; not compatible with SR-25 variants. Barrel nut and
hardware are included.
* This item is NOT eligible for International Shipping