I want to shoot my firearms. Blasting rounds through an old military pistol, made of plain carbon steels, and possibly teetering on the edge of a firearm grave, does not make economic sense.
These Tisas pistols are new, produced on CNC equipment, mine are reliable, and before taxes $350.00. They are close enough to GI that I have had the "real experience". And I can say, GI sights are god awful bad. They were developed for punching holes in round circles on square targets at 25 yards. They work well (for 20 something eyes) in that role because the primary hold was 6 OC, but a thin front allows hold off at 5 OC, 3OC, etc, as needed to adjust for offset of sights. As self defense sights, they are awful.
Another thing about these Tisas pistols, they are made from an 4140 equivalent, hardened before machining, which provides the promise of a longer wear life. GI slides were hardened two inches from the nose. The frame was unhardened. The steels used, 1035 used in the frame is close to the cheap steels used on rail road spikes, and 1055 is used on lawn mover blades because it is tough, and cheap, cheap, cheap. GI pistols only had to last 5000 or 6000 rounds, so the minimum materials to make that, were used in the pistols. Don't fool yourself thinking the things were built to last. They were built to the lowest price point that met lifetime requirements.
materials used GI pistols
this is what you can expect to happen to a GI slide between 10,000 and 20,000 rounds.