Daewoo K2 barrel attachment

[AlexanderA]

We all know how the AR-15 barrel is attached. The barrel (along with its extension) is pressed into the upper recever, and then secured with a threaded collar.

The Koreans adopted a simpler system with their Daewoo K2. Like the AR, the barrel is pressed into the upper receiver. But there is no locking collar. There's a tubular retainer that enters the bottom of the receiver, and locks into a hole in the barrel extension. This retainer is internally threaded for a standard Allen setscrew. If you drive out a transverse roll pin (that positively secures the retainer), insert an Allen setscrew, and tighten it, the retainer backs right out. Then the barrel can be pulled straight out of the receiver. Reinstallation involves simply driving the retainer back in. (It's a press fit.)

I'm continually amazed by the genius of this design. The only significant drawback, IMO, is the 180 degree safety. But that can be replaced by an aftermarket 90 degree safety.

 

[Destructo6]

The Koreans adopted a simpler system with their Daewoo K2. Like the AR, the barrel is pressed into the upper receiver. But there is no locking collar. There's a tubular retainer that enters the bottom of the receiver, and locks into a hole in the barrel extension.

AR-15 barrels are not a press fit. The barrel nut is torqued into place and the gas tube double locks the nut (2 functions in one).

While I appreciate the Daewoo series, I can't see how it's any simpler.

 

[AlexanderA]

AR-15 barrels are not a press fit. The barrel nut is torqued into place and the gas tube double locks the nut (2 functions in one).

"Pressed" is the wrong word. The barrel slides (is that a better word?) into the upper receiver, is indexed by a pin going into a notch on the receiver, and then is secured by the barrel nut (collar).

The Daewoo is simpler in that it dispenses with the barrel nut. The Korean engineers were free to pick and choose among the best features of a host of existing designs.