I currently own a Mkll Slabside Target, (w/Red Dot) and a Mkll 5 1/2" bull barrel. Most any ammo works ok in mine as long as the bullet is copper washed. Both of mine do well with the Federal 550 packs, but the one ammo I have never had a problem with is the CCI Mini Mags. I shoot NRA falling plates and the Steel Challenge with mine so I put a bit of ammo through mine each month. I clean mine monthly, right before the next Steel Challenge. I have not found disassembly/assembly, to be particularity challenging, although some seem to have problems. It took my next door neighbor, about half an hour to learn using the Owner's manual. That was after I replaced the hammer and hammer bushing of his Mklll with Mkll parts, eliminating the magazine disconnect. Never owned a Buckmark, but I know a few shooters that do, For the most part, they have good things to say about them. I'd say if you stay with a Ruger or Buckmark and use good mags and ammo, clean and lubricate now and then, you'll be happy.