WHAT DOES COLT SMG UPPER MEAN?

What Does colt smg upper Mean?

I love these sights Individually and they're several of the most robust and perfectly-designed sights around to the AR fifteen. They function a small and huge aperture and around the modest aperture there is a set of open up box sights for rapid-fire near-quarters use.  I haven't decided on a flat prime or A1 (without the need of FA and deflector

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