Quoted: Seriously? I read a while back that moisture could get trapped under the FSB and cause rust. Is this nothing more than an urban myth?
What about M4 feedramps. I'm building a 16" midlength that will lead a life of law enfocement so I need maximum durability and ultra reliability.
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Parkerizing is a water based solution.
When they parkerize barrels, the barrels are in a boiling hot bath for 5-10 minutes.
If parkerizing solution can't get under the FSB, what are the chances that enough cold water to cause a rust problem will get in there during use?
Is there a little rust under there? Sure, but it's really just a discoloration, not a growth.
Will it ever be an issue? No Way.
Ok, let's say you have found the perfect barrel, all the features you want and 2 different makers sell it for the same price.
The only difference between the 2 is that one is parked under the FSB and one is not.
Take the one parked under the FSB.
Now, let's say that the one parked under the FSB is $20 more, take the non-parked one, it's just not an issue worth even $20 over the life of the gun.
Yes, I suppose if you spent your days in the swamp, that water could get under the FSB and cause rust, but beyond that, it's a non-issue.
The first time you start shooting, you are going to heat up the barrel enough that all that moisture dries out in there from the small amount of gas leakage at the FSB.
Now, M4 ramps GOOD.
You want those for sure.
They are not really required if you have all perfect magazines, but they will save you from marginal magazines should you end up with one.
The majority of feeding issues in the AR are caused by magazines.
Buy good ones and throw them away when they are worn out.