hk heckler airsoft gun hk heckler & koch hk heckler hk heckler & koch usp 6mm bb pistol airsoft gun magazine hk heckler & koch usp .177 caliber bb gun air pistol hk heckler & koch p30 electric blowback 6mm bb airsoft gun hk heckler bb gun hk heckler & koch usp .177 caliber bb gun hk heckler airsoft gun metal hk heckler & koch ump aeg 6mm bb rifle airsoft gun