Obsidian Arms Modern Rifle Upper Receiver Vice Block

Very nice block for the money. If you don't already have one and are planning on working on your upper this is what you need. Very simple design that gives support both internal and external. I have used it to put a few barrels on so far and it has worked great.

Good solid unit, but just a heads up this won't work with non-reciprocating side charging uppers (found this out on a build). Other than that this has performed well

This is great for quick securing upper for anything . I’ve have many different vise blocks , this is my favorite

This product is poor quality, the block is loose and will not hold the upper very good. I was not happy with this.

Fit my rugar 556 lower like a glove

Perfect fit, good material

Works great!

This was exactly what i need to finish my upper. It made the work that much easier. Excellent product.