This really got me thinking so i recently got a Egyptian Maadi AK-47/AKM and the first and only thing i have shot in it is. Tula 122gr Steel Cased 7.62x39mm Berdan Primed non corrosive you know the cheapest stuff you can get nowadays. Got it at walmart for $5.47 a box 20 per box anyways now i know it says it is not corrosive. However i was just reading somewhere how that even though the powder they use is not corrosive the Berdan primers are corrosive. I guess it is better to assume that yes the Berdan primers are than not right. Anyways so i just field stripped the gun about a week ago i use a combination of Ballistol,CLP,Gunscrubber,Hoppes 9 Solvent. Always all these Chemicals/Lubes whatever gun i am cleaning whether it is my (my Prized no longer Italian Imported Beretta 92FS,1911'S Inox,Glocks,AK'S,Shotguns you know etc.) Off topic LOL anyways i read recently i can't remember where where a guy way shooting the above mentioned tula ammo same weght/grain caliber etc. Well i guess his firing pin module/housing you know that little hole where the firing pin lives got all rusted from the inside out from what he claims was the berdan Primers of the above mentioned ammo????? he said he never disassembled the firing pin module/housing to be never taking apart and cleaning the actual Firing Pin Module/Housing. Now usually when i clean a gun i don't take apart the firing pin My Method for Cleaning and Preventing rust in the Firing Pin Module/Housing is what i call "DROPPER BOTTLE" it is described as follows i just take these eyedropper needle bottles filled with CLP,Ballistol,Gun Scrubber and drip all 3 yes all three of these chemicals into the little hole where the firing pin lives. I obviously scrub the entire gun with all of these chemicals with brushes and wipe until white with patches,Run Bore Snake and Hoppes 9 solvent and patches though the barrel till patches are whiter than snow. But i never really thought about taking apart the Firing Pin Module/Housing should i be doing that. I mean i take pride and Care for my Guns obsessively. My (No Longer Italian Impored 92FS Beretta Inox is what i worry about the most) even though i don't shoot steel cased and/or berdan primed ammo in that Heirloom. I think i have actually only ever disassembled my Glock Firing Pin Modules down to the bare firing pin for cleaning itself now that i think about it. Bottom line i guess don't quote me on this i was only told by someone at the range after i told them about the article i read. Berdan Primers are Corrosive even though the powder in the steel case it not WOW PLEASE I HOPE I AM WRONG ON THIS. But then again also i was told that powder/carbon and dirt will eventually attract moisture (even if it not Corrosive ammo or Berdan Primed) That is why i am so OCD about my Gun Cleaning it is blessing and a curse So any of you guys Completely Disassemble your Firing Pin/Modules down to the bare firing pin whenever you clean regardless of firing Berdan Primed ammo? My "DROPPER BOTTLE" Method should be sufficient at keeping my Guns that i have fired Berdan Primed ammo Free of Rust right??? Or is a Firing Pin Module/Housing Complete Disassembly Necessary??? i Have been shooting for 11 years and this is the first time i have ever heard of this scared me a little like i said. Thanks fellow powder burners.