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Page AR-15 » AR Discussions
AR Sponsor: bravocompany
Posted: 1/27/2009 9:33:15 AM EDT
Have a Bushmaster HBar 16" A1 upper Post-Ban.  Purchased used.  Has a threaded hole on the back lower part of the front sight below the barrel.  Hole is above sling swivil conection.  Anyone know what this is for?
Link Posted: 1/27/2009 9:49:21 AM EDT
Link Posted: 1/27/2009 9:58:39 AM EDT
The hole is how they drill the hole for the gas block.  They are sometimes tapped and a set screw is used to hold the FSB in place while the holes are drilled/reamed for the taper pins.
Link Posted: 1/27/2009 10:07:51 AM EDT
Thanks for the information.  Wanted to ensure nothing was missing.
Page AR-15 » AR Discussions
AR Sponsor: bravocompany
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