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Jul 06, 2012 · Back up iron sights, or BUIS, are a popular accessory for AR and M16/M4-platform rifles, with the primary reason for their purchase and use being that they offer a second method of aiming the ...
Standard, gas block, or micro height: If you’re mounting the front and rear sights on rails that are the same height, then you would use a standard (same-plane) front sight. If you are mounting the sight on a gas block that sits lower than your rear sight, then use the sights designated as “gas block” sights.
Jan 13, 2012 · Hi all, Heres my question. What rear buis options will work with the standard FSB. I am swapping out my carry handle upper for a flat-top upper and wondered if there are compatible rear sights, or do I have to go the new gas block route, with a new front sight as well?
Matech Sight, Fits Picatinny, Black, Rear, Ranging Aperture, Flip Up BUIS. I believe there is not. This is the exact same rear sight now used on M4s in the US Army paired with the standard gas block mounted front sight post seen on most ARs.
XS Big Dot Trit Mossberg Front Sight Bead Plain Barrel Shotgun SG-2003-3 ... MaTech Black 200-600m Rear Back Up Flip Up Iron Rifle Sight Fits Picatinny BUIS. $87.60 ...
Cheap Front Sight Screws Sight Parts At Brownells And Gun Tech Tip 6 Remington 87