Free Float Tube Bipod Stud and Nut

DPMS recommends the nut and stud above for installation on FF handguard for bipod. I can screw the front part of the handguard off easily. See pic below.

http://i244.photobucket.com/albums/g...bineFFTube.jpg

After marking the location for the stud at bottom center, I could unscrew the handguard and drill and tap. Then mount the stud and the nut inside. Problem is the clearance between the inner edge of the handguard and the gas block. Seems like not enough space to allow the handguard to screw back on with the stud and nut installed. Has anyone done installed a sling stud on a DPMS LR308 FF handguard?
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