Modular Rifles: A Tale of Two Patents

    Last month Bushmaster was awarded a patent (#7810271) for an AR-15 (or AR-10) compatible modular rifle system. The patent proposes using a mag well that can be removed from the lower receiver. The mag well could be any conceivable length in order to accommodate special upper receivers. In theory, cartridges as big as the a .338 Lapua could be used with this system.

    Bushmaster Patent #7810271

    While this patent is interesting, what makes it even more interesting is that back in 2006 Colt Defense was awarded a patent for a similar concept.

    Colt Defense Patent #7131228

    Solider System dug up the Colt patent when we were all trying to work out what Colt’s upcoming modular rifle would look like. The Colt Modular Carbine CM901 has since been unveiled and we know that it does not make use of a detachable magwell.

    It will be interesting to see if Bushmaster run with this concept.

    Steve Johnson

    I founded TFB in 2007 and over 10 years worked tirelessly, with the help of my team, to build it up into the largest gun blog online. I retired as Editor in Chief in 2017. During my decade at TFB I was fortunate to work with the most amazing talented writers and genuinely good people!