Question for someone truly knowledgable about Colt lower receivers. Are lowers with the "Sporter Lightweight" designation made of a lighter weight alloy than other Sporter (HBARS, Target, etc.) receivers. Or is this just marketings way of designating the carbine Colts with 16" standard barrels as having lighter overall weights. I ask because someone had made the comment that "Lightweight" lowers were less expensive and less desireable than their counterparts. My observation has been that the most "Lightweight" models seem to have all the features (raised fence, small pivot pin) that are more desirable. Less the sear block, of course. Hey, I wish Colt had never dropped the "AR-15" designation in favor of the weaker and more PC "Sporter" monicker, but that aside,
does it really matter? Heck, isn't there a post-ban Colt model called a "CAR-15 A3 Tactical"? What's up with that? It's not even a carbine!