2012年3月17日 · Manganese Phosphate Barrel Finish Barrels are parkerized with the manganese phosphate finish (Mil-Spec A-A-59267). Military specifications also state that the entire barrel surface is phosphate finished to create a porous surface to absorb oil as to resist against corrosion from the elements. BCM barrels are phosphated before installation of ...

2004年12月18日 · Manganese Phosphate is the parkerizing that is on the barrel assembly and a few small steel parts like the selector and bolt hold-open. The receivers and most other metal parts are aluminum that has been hard-coat anodized. Folks use Birchwood Casey Aluma-Black for the receivers.-Troy

2017年8月20日 · Have milspec phosphate and chrome and also OK. Making Ni/Bor or Ni/PTFE perfectly clean requires Flitz and bow grease and makes them shine. I find that mildly annoying.

2020年12月22日 · The Nitride is actually CHEAPER than phosphate, which was surprising to me as I thought Nitride wouldve been more expensive. Its not a big difference, $20-30 bucks, and is a wash pretty much, but found it odd that phospate from PSA was more expensive as I thought it would've been the other way around.

2012年2月16日 · Pretty sure you meant Manganese Phosphate, and yes, its only referring to the barrel's exterior finish. If the interior was chrome lined, the ad mostly likely would have stated so. If the interior was chrome lined, the ad mostly likely would have stated so.

2022年11月6日 · I just got a BCM complete upper, and the barrel coating is manganese phosphate. I have never owned a phosphated barrel before, and I was wondering if there is any special treatment that needs to be done to preserve the …

2021年1月1日 · Phosphate is just too rough. Nitride has a very smooth almost polished finish that is much easier to clean and slides in the upper much easier. Posted: 1/3/2021 1:15:10 PM EST

2021年12月21日 · Phosphate is only done on a barrel's exterior surface and not the bore. This is because mil-spec type barrels are chrome-lined first and chrome won't stick to phosphate or any other coating, so bore needs to be raw metal for the CL to work. Those barrels that aren't CL are just rifled and why oiling the bores is so important to prevent rust.

2006年2月1日 · The pre-black coats the metal and makes that part look black. Then you use the phosphate solution to seal the pre-black. The method will make all the parts the same color regardless of heat treating or dissimular metals. Those parts that you want a grey color, you just use the phosphate solution by itself.

2023年11月16日 · Phosphate coatings (iron, zinc and manganese) are conversion coatings, they convert the outer layer of steel to a heavy crystalline matrix. This matrix is relatively hard, and very porous. Corrosion prevention is due to the coating physically sealing the steel away from the oxygen in the air.