HK USC Carbine Failure to Eject or Extract Clearance

Tom Clarke ATAC TV Firearms Channel demonstrates the possible malfunctions of the HK USC Carbine. Knowing the cycle of operation and the configuration of the firearm will help understand how the gun functions, and indicating how it will malfunction. 

The HK USC is a very reliable blowback system with a very large ejection port. Big ejection ports are a good thing and allow the extracted brass plenty of room to eject out of the firearm. There is a down side to the configuration of the carbine. The barrel or chamber of the carbine is recessed forward of the ejection port by about an inch. Also there is space between the barrel ring and the inside of the firearm port large enough to trap extracted brass if it is not ejected. The bolt continues to cycle, stripping a new cartridge out of the magazine and into the chamber, while ramming the spent brass into this recess. 

Tom Clarke and Mark Flinn spent considerable time inducing malfunctions with the USC carbine in many different scenarios. This is the only malfunction other than Fail to Fire that the carbine tends to create. This is a real problem to clear the malfunction and get the firearm running again.  As Tom suggests, this would be a great time to transition to a back up weapon system and run for cover.

The clearance for this type of malfunction involve removing the magazine, locking the bolt back with the bolt stop lever and digging the brass out of the port with your fingers and /or some type of tool. When the empty brass lands just right inside the port, the bolt slams the brass into the recess and makes it really hard to pry the deformed casing out of that area.  It turns into the “luck of the draw” where the brass might fall out, or must be pried out with a tool.  This may be something that will take time and tools to fix.

The HK USC Carbine is a great shooting, light-handling firearm with plenty of punch. The ATAC guys have fired a lot of ammunition through these guns and did not experience any malfunctions other then the ones produced by the staff on purpose. Even when extremely dirty, the firearm performs flawlessly. If you know your firearm, you will find any limitations that may affect the performance of that particular weapon system. Again, training is the key to understanding you’re your performance with any firearm. Watch Tom Clarke and Mark Flinn explain the details of the HK USC Carbine in the video linked below. Keep training!

Watch the ATAC TV Firearms Video Here:  HK USC Carbine Failure to Extract or Eject Video

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Tom Clarke ATAC TV