11.5" Barrel, URX II Medium, Gemtech Halo, BC 2.0

[serbonze]

Has anyone tried this combination? I have an 11.5" upper with a 10" rail, but a URX II is available for me give it a try. My main concern is the room necessary for the adaptive collar and the beginning of the rail.

If this has been covered in another thread, please let me know. My orange search came up empty.

[saddlerocker]

im not familiar with Gemtech's mounting system, but the URX II on an 11.5" leaves very little room behind the thread shoulder, about .2"

So how far back over the shoulder does the gemtech need?

[E-man930]

Here is my 11.5" KAC SBR upper with an AAC brake to illustrate saddlerocker's point...

http://img31.imageshack.us/img31/2408/sbrbrake.jpg

http://img11.imageshack.us/img11/2899/canssgc01.jpg

[RCO'B]

It won't work, not enough clearance for the collar to slip over the BC because it will sit so flush to the end of the rail. A 12.5 barrel would work or change it up and go AAC route.