Tube that can be used to make a Semi Auto CZECH 23, 24, 25, and 26.  This has a blocking rail installed and can NOT receive a full auto bolt.  The endcap notches are machined and it has a CAD drawn template.  This will work with our semi auto bolt kit and accept an original barrel trunnion.  This is NOT a receiver and does not require a FFL for purchase.  It is not guaranteed to work with parts that we do not design or manufacture.