A Short while ago I have found Numerous uppers which are choose offs from rebuilt M16A1 rifles becoming bought as "new replacement uppers". Personally, I would not make use of a drill push. It may be carried out, but I would go the router or mini mill route. Not merely https://andykosdh.creacionblog.com/31131170/the-greatest-guide-to-colt-m16a1-for-sale