If you do not reload for the 9mmx19, you might consider the Winchester white box ammo sold about everywhere. Most folks do not use steel cased ammo in prized weapons, as case steel is harder than barrel steel. Steel ammo is war ammo, cheap etc etc but works good once. Wear on some of those weapons is a moot point to those that need/use them. I would like to think that the Luger is built to tighter tolerances than some of these other weapons.
Hot ammo is hot ammo. Up from there is submachine ammo. Either will beat the handgun firearm to death fairly shortly. Anyone can shoot hot ammo and have their pistol work fine........for a while. Luger parts are expensive and somewhat elusive at times, not as bad as original automag parts, but the toll is there for replacement parts. Good original parts and good reproduction parts are available, but so are some of the other reproduction parts. I have not bought parts for long time, as had a stash, but recently tried some reproduction holdopen parts a friend gave me, I could bend them like a pretzel.
You might be able to bend the oem hold open spring some for more downward pressure. Tis tempered, or at least at one time, and may snap, so there is some risk to that part if that matters at this time. Take your time, and don't have all the fun at once.
Note that the arty barrel has a recess for the rear sight, the barrel and toggle moves quickly in the basic function of a live round being fired, the mechanical recesses attempt to keep the sight assembly in place. The smallish teeth on the side of the sight tend to shear with time in grade of shooting. The little spring loaded push button retainer engages these teeth for elevation adjustment......but the things moving quickly and abruptly take their toll on said smallish teeth and their engagement. I have never heard of anyone repairing these teeth even with microwelding($$$) but I do not get out much anymore. A friend of mine with almost no teeth on his arty's sight uses a mini bungee cord to hold the sight....down; he gets teased a lot, but he can shoot...........very well.
As you probably have noted in viewing the internet, most oem Luger sights are integral to the rear toggle piece. Tis a war weapon, used close up sorta speak; in that regard, sights are a decoration. The arty was in a class of its own, other than the 100/200 navy sight; but those were early times I guess. Adjustable rear custom sights have been used in Europe and over here for a long, long time. Lots of lessons learned in putting a sight on the barrel or the rear toggle. Weight is an issue with a barrel mounted sight or optic as to basic function. There was a guy here on the forum that made a custom basic for the arty barrel interface and used a red dot, he shot coyotes out of his garden with it. He told me that he went thru a lot of cheapo red dots before he found one to hold up and yet allow repetitive firing function.
In the rear toggle of a custom sight, those that simply silver solder the sight housing or sight onto the toggle will probably experience failures due to stresses of the movement(shear). Usually the screwed on ones do not last unless mechanically locked, in my opinion. The more successful custom rear sights have some recess in said toggle to take the brunt(shear) of the movements of the rear toggle. fwiw, some adjustable rear sights oem, just fall apart on the Luger toggle, while others seem to hold up more better. Some of the better choices for sights attempts are no longer built. Some are pictured here on this forum fwiw if so interested.
So if you engage a fellow to build a custom rear housing with sight, the effects of shear and movement of said rear toggle need to be known. If you go with a oem ladder arty sight, keep in mind the teeth if shooting a lot or not.
All of this is purely opinion and a little experience with tearing up(trying) things(failures), followed by successes from knowledge/techniques acquired. Again, just opinion.
If it was my pistol, I would put a new recoil spring in the pistol; just habit with me with a new firearm, but..........as usual.........just opinion. I might check the little leaf springs and coil springs for tension ability and return after stressing.
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