looking for tritum BUIS, I think that's righ...t the ones that glow in the dark

What sights do you have?

There are many places to buy a front sight post containing a tritium insert. However, some manufacturers sights do not take a "standard" sight post and therefore, I don't think tritium is available for them. You only need a tritium post on the front sight. On a rear sight, your face is so close to it when shooting, it gets washed out.

ohh ok thanks for educating me....right now I don't have any because I don't have an upper. Im about 90% sure im gonna get the DSG upper just don't know if itll be 5.56 or 300blk

https://dsgarms.com/dsgu-556-16-mcsr15-agb-a2

Any sight that takes a post like the ones in the images here can use a post with a tritium insert. Basically, if the sight takes a standard, screw in post, you can get tritium.

Many companies sell their sights with tritium inserts already installed as well. DSGarms is a good company. You might see if they offer any of their front sights with tritium to save on waiting and shipping.

Absolutely.  I remember a guy showing me his M1A with night sights.  When it got dark and you shouldered the rifle the glow from the rear sight made your eyes unable to see/focus on the front sight.

Do you have a handgun with night sights?  Hole the gun up so that the rear sight would be as close to your eyes as the rear sight of a rifle and you'll see what he's talking about.  It works okay if both sights are some distance from your eyes but up close the amount of "light" messes with your eyes.

 

Put your money towards a good flashlight instead.