"So yeah, this metal body is very rugged, but I had to cram some wires in there, and had to take out the bolt ornament. It also came with lots of scratches and was missing a hex screw for the rear reciever pin. Not such a problem untill I figure out that my mags wont stay in. gonna fix that by filling down the block for the mag catch plate. Also, I had to use my Echo1 buffer tube for my king arms internals, so I don't know how you would fit aformentioned buffer tube on when they're ordered together. Also, I have mag feeding issues. All of this is irritating, but fixable. All in all, a fun project to accomplish, but it has a few flaws like everything in this world. So, as a result, I am giving it 4 out of 5 stars. It gets an extra star for durability."