I think if you really want 100% propane ready 1911/2011, you might want to think about the newer KSC/KWA full metal 1911 or 2011s. They can be had with aluminum slide stock(apparently actually machined aluminum and not pot metal). Issue with them is that except inner barrel and high flow valves, and perhaps springs there isn't much you can do to them. And their metal 1911 is only available in tradition GI style, which means difficult to use sight.
Aside from that, I'd stay away from WEs. They tend to be worse on efficiency than TM, and certain parts(such as the recoil spring plug) will fail on them rather quickly....even with the newer "Wilson Combat" or "Socom gear" line of 1911...
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