I recently bought a rock river arms upper with barrel stamped kb mfg 1-9 mpi, can anyone tell me info about quality of barrel, company contact or any details of their use of these barrels
KB was a spin-off of Model 1 Sales (divorce) and I believe now defunct. They were a low cost option with decent reputation for quality. I don’t know which RRA Upper you have but my guess might be that someone decided they wanted a different barrel length or contour and swapped.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.