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...Company]] '''Rail Adapter System II Upper Receiver Extension''', or '''RAS II URX''', is a free-floating rail adapter forend system for [[AR-15]] type [[ ...cher]] prohibited free-floating of the rifle [[barrel]]. The follow-up URX II rectified this by accommodating a modular mount for the M203 that does not

|caption= An M4A1 with SOPMOD package, including Rail Interface System (RIS), flip-up rear sight and Trij ===SOPMOD Block I===

...em, and not just an add-on upper receiver assembly (part of the proposed [[SOPMOD]] upgrades). The SPR was eventually type classified by the U.S. Navy as th ...6A2/A4. The SPR program appears to have grown out of both the SOPMOD Block II program, and the U.S. Navy SEALs [[SEAL Recon Rifle|Recon Rifle]] (a 16" fl

[[Image:SOPMOD 2-2005.jpg|thumb|300px|right|SOPMOD Block I]][[File:SOPMOD Barbie.jpg|thumb|300px|It is indeed.]] The '''Special Operations Peculiar Modification''' ('''SOPMOD''') kit is an accessory system for the [[M4 carbine#M4A1|M4A1 carbine]] use

... or just "Crane") as its own project following the CQBR's removal from the SOPMOD program. Just as the Special Purpose Receiver morphed into the Special Pur ...atch so it would not slide out of the desired position. The current L7LA2B SOPMOD stocks are made by Lewis Machine & Tools and have none of these problems.