Serious Problem with DD Fixed Irons on BCM Rifle

[georgeib]

I use a DD rear with standard front sight/gas block. My zero is 36 yards and the front post is nearly bottomed out, works for me. The ears for the front sight do a good job of protecting the KNS pin head front I use.

The KNS sight posts tend to be longer than standard, which explains why you're bottomed out. No harm, no foul though as everything works.

[1986s4]

The KNS sight posts tend to be longer than standard, which explains why you're bottomed out. No harm, no foul though as everything works.

Not bottomed out but low I'd say. If it were bottomed out I would change something so that the front could come up a bit.

[duroSIG556R]

It's possible you may have bought a front sight designed for a2 and not a same plain front sight. Also keep in mind the height over bore with an ar15. Holdover is always needed within close range. Try zeroing at 50 yards. One of my favorite front sight posts is from blitzkreig. The post has a built in offset.