AlexanderA
Member
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.
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.