Quick take-down firearm

Abstract

Quick take-down firearms and methods of using quick-take down firearms. The quick-take down includes an upper receiver coupling and a barrel coupling. The quick take-down can be unlocked by sliding a sliding lock collar in a translational motion to an unlocked position to release locking elements from a locked configuration. In the unlocked position, a barrel and handguard may be installed onto and removed from the upper receiver of the firearm. Releasing the sliding lock collar returns it to a locked position, securing the barrel and handguard to the upper receiver.

We claim: 
     
         1 . A quick detach facility for a firearm having a frame and a barrel defining a barrel axis, the facility comprising:
 a first connection assembly associated with the frame;   a second connection assembly associated with the barrel;   the first and second connection assemblies being selectively matable with each other and having a mating mechanism movable between a released position in which the first and second connection assemblies are separable from each other and a locked position in which the first and second connection assemblies are secured to each other for firearm operation;   the second connection assembly including an inner ring having an inner surface configured to contact a selected portion of the barrel;   the inner ring having a tapered outer surface;   the second connection assembly having an outer ring having a tapered inner surface configured to closely receive the outer surface of the inner ring; and   wherein the inner ring is adjustable to accommodate a range of barrel diameters.