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The review title says it all, really. I was pleased with the accuracy but I found it very unpleasant to shoot due to the barrel being seriously overgassed. The gas port was huge compared to my FN and Criterion barrels. This led to difficulty with follow up shots at longer ranges, increased gas in my face and the feeling that the gun was beating itself to death. I tried taming it with heavier buffers and spring combos with little success. I know some people swear to the quality of BA but I really do not like this barrel. Also the nickel boron coated barrel extension adds to the outer diameter so it may be difficult to install into an upper receiver without heating it up first, so be aware of that.
I wanted a new mount for my Romeo 4M that came with the single, skinny crossbolt mount. I felt that such a good optic was hindered by such a budget mount. After lots of research I decided upon the Midwest QD mount. I am glad I did because it is PERFECT. Mounts directly to the Romeo 4M with ZERO modification. The height of the MI mount is the same as the stock Romeo mount so absolute cowitness was not affected. The mount locks up very strongly on the rail when properly adjusted. I would have liked to have seen some recoil lugs built into the bottom of the mount but oh well, it's not going anywhere. If you have an older Romeo 4 or 5 that comes with the single crossbolt mount, this is the mount upgrade you need.
I love the undersized extension. You will need to apply heat to seat your barrel in the receiver. I greased the barrel extension, applied heat to the receiver with a hair dryer, and the barrel slid right in. Definitely the most secure fit of any upper receiver I have ever used. Machining and finish are both excellent and BCM applies a dry film lubricant to the interior of the receiver. I am very pleased with this one and will definitely use this receiver for future projects.