Consider a MARVEL conversion that is made for a 1911 frame.

Lots of options on 1911 Based frames, stocks, triggers, hammers, available spare fire control parts.
Many magazine options. Colt ACE, Ciener 15 round,

Some companies such as Ruger don't sell fire control parts.

You can use iron sights, scopes etc. Easy take down and excellent service from MARVEL.

If you want light weight consider a alloy 1911 frame.

This pistol will cost more up front. But you will never regret it twenty years from now.