"Samson manufacturing makes high quality products that can be used on your ar-15. However they have very long lead times on their popular items and customer service response times to emails are somewhat slow. If you're going to purchase from this vendor, you may want to contact them first to see about availability and lead times . As of 16 April I'm still waiting for my order placed on 18 March to be processed. AR15 is apart waiting for parts. Not real happy. Previous order showed quick but not this one."