It is "not" the duralumin butt cap, but can be made from aluminum ...or brass. S.E. Asia, along with many other Asian tours of duty found the term, quite frequently reffering to the covers the locals would wear...and "that" is about as polite as I can word it. One look in the catalog will quickly show you the difference is shape, verses a standard butt cap. Best, Capt. Chris
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Capt.Chris Stanaback
RKCC/RKCA Founder
RKS #016
NRA Lifetime Member
CAPTSTANABACK@aol.com
WEBSITE: www.captstanaback.com