My front sight is from Midwest Industries, made from aluminum.

MI-LFFR <br>Low Profile Flip Front Sight, locking

The rear is from Magpul:

https://www.magpul.com/products/mbus-sight-rear

I have never used a magnifier, but there should be enough room if you arrange the sights to accommodate one. The front sight is mounted on my gas block, that's why I used an aluminum one to handle the heat.