{HEAD ~ The receiver} includes {TAIL ~ a receiver extension} which is rigidly connected with a stock 30 
{ HEAD ~ The receiver } includes { TAIL ~ a receiver extension } which is rigidly connected with a stock 30
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH