Abstract: A flexible fit, easy to attach and align, firearm adapter that allows secure fitment of a muzzle device, such as a suppressor, to a broad range of firearm sizes and shapes, with a single device. These firearms would include difficult to fit barrel profiles that in many cases would go unsuppressed without this improvement over the prior art. An embodiment includes an anchor securable to a smooth section of a firearm barrel and a housing adapted to engage the anchor. The anchor and housing are sized to reach over or around barrel obstructions. An embodiment includes an alignment guide to bring the barrel into axial alignment with the muzzle device.