BUIS Question...

[James R.]

So I'm gathering more parts and need back up iron sites. I settled on the ARMS 40L (Low Profile) for the rear sight, but I don't know what to do for the front sight.

The guy who sold me the 40L warned that I should be careful in selecting the front sight as he has heard of combinations which didn't work out elevation wise.

I think ultimately I'm going with either the Rock River A4 Varmint upper or the DPMS Varmint upper, both of which are flat top A3 type configurations which have a rail on the gas block. I assume there's no standard for the elevation of the gas block so any front sight I mount is going to be at the mercy of the gas block design.

Does anyone know of a front sight they're certain will work properly with the ARMS 40L and an upper like the RRA A3 Varmint?

Regards,

James R.

[PLINK]

No certainty here but some front sights to look at.

http://www.yankeehillmachine.com/store/sights.html

YHM has a front flip sight at to different heights. I have a front flip YHM sight on a railed gas block and my rear sight is a DPMS (non-flip) on a Flat top upper. I could take some measurements for you if you like.

[James R.]

No certainty here but some front sights to look at.

http://www.yankeehillmachine.com/store/sights.html

YHM has a front flip sight at to different heights. I have a front flip YHM sight on a railed gas block and my rear sight is a DPMS (non-flip) on a Flat top upper. I could take some measurements for you if you like.

Yeah I looked at those, I just wonder how everything is going to measure up. It's not like all these manufs give detailed drawings. It makes me wonder if there isn't a standard. most of the railed gas blocks I see have the rail below the level of the rail on the A3 upper. I wonder if this, "drop from the upper" is a standardized thing. If so then everyone should just make their flip up front site the same height and it all works out. I don't want to have the front sight post screwed to some extreme to get zero.

Regards,

James R.