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Posted: 4/8/2006 6:35:28 AM EDT
A picatinny rail gas block that is the same height as the rail on a four rail FF tube and flat top receiver? In other words a gas block that you could mount a flip front site for a four rail float tube on.

Link Posted: 4/8/2006 6:47:29 AM EDT
Check out sinclairs or some of those folks. My guess is they're out there, but if it's the same height as the FF tube, it may make installation a bit more challenging. I've got one that's pretty high on my carbine but it isn't the same height.

Are you using this as a BUIS or a primary sight?
Link Posted: 4/8/2006 6:56:46 AM EDT
BUIS. I want to put it on a midlength with an extended four rail FF tube (approx. 13") that has the
gap in the top rail for the gas block/front sight. I'd like to be able to attach a front sight to the gas block when needed, and have a continuous height rail when the front sight is not installed.
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