Old gun catalogs, on line auctions, gun shops, gun shows, libraries
No. Strictly speaking, Glocks are "safe-action" which is a Glock proprietary term. Glocks are neither double action nor single action. They have attributes of both types.
LDA is one
You pretty much have most of it. Check the auction sites to see what they are selling for.
It's a slightly simplified version of the Finnish Lahti L-35 pistol. See the 'related links' section at the bottom for more information.
No external hammer to allow single action fire.
It is a double action pistol
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A double action pistol that chambers a .380 ACP round. AKA 9mm Kurz
To turn your tanfoglio gt380 into a double action pistol can take a lot of work. You will have to buy a lot of different parts and a lot of time to make this work.
A single action pistol, such as the 191A1 .45 Auto, requires that the hammer be cocked before the first shot. A Double Action pistol does not need to have the hammer cocked- pulling the trigger causes the hammer to rise and fall. Some are DAO- Double Action Only- the hammer cannot BE cocked, and must be fired from a "hammer down" position. These include the Para-Ordnance LDA pistols.
Air cooled, magazine fed, recoil operated, double action, semi automatic pistol.