Winchester 1886 45/70 An improvement over the 1873, the 1886 Winchester was chambered for such powerful cartridges as the 45/70 and 45/90. It is likely the strongest lever action rifle ever made, and lead to modern designs. It took lever actions out of the pistol cartridge class and into the Big Bore world.-SR
Assuming your handgun is properly zeroed, sight alignment issues will show up quickly on target—as in these examples. At far left, proper sight alignment: Top of the front sight even with the top of the rear sight, front post centered in the rear notch.
Mark Housel http://www.landmprecisiongunworks.com has figured out a way to mill a P30 slide to where it will accept a mini red dot sight, retain all the safeties and have co-witnessed suppressor height iron sights.