just bought a dpms sportical. This rifle has no optics out of the box. I have a red dot on it but I still want iron sights as a back up. I found some on amazon from ade advanced optics. They were $30 for the set. The description say they are made of steel and aluminum and the front is for a low profile gas block. I have never used any product from this company and I was wondering if anyone has any info about them. Any info will help. Thanks