Additionally, the means for cooperating with the retention catch further including means for securing the adapter in place within the secondary receiver chamber when the magazine catch of a rifle is moved out of {HEAD ~ the through opening} of {TAIL ~ the adapter} 
of
Additionally , the means for cooperating with the retention catch further including means for securing the adapter in place within the secondary receiver chamber when the magazine catch of a rifle is moved out of { HEAD ~ the through opening } of { TAIL ~ the adapter }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL