for reasonable cost. Sold my Ruger SR-556e piston rifle today and threw in my factory sights off my MP 22 to close the deal. I have a new and unused Vortex Strikefire for this rifle but I have been reading that a few folks have difficulty sighting this optic in. This is going to be used for a little fun at the range only. I can use the Vortex on my AR 223 if need be. If I do decide to add conventional sights I do not want to shell out $90 for the Magpul MBUS that are very popular. Is there a less expensive set of conventional sights that would be an acceptable alternative that is good enough for the casual shooter without going the Magpul route?