I can see that if I were ST, knowing how the "community" is, having had to decide weather to just say "hey these are FN barrels we had made" and have a chorus of people calling BS on them, or to put FN on there to say "yes, they are, look we marked em FN, we'd be in court if we did that and they weren't, right? so there." Makes sense to me. It's marketing. We had t-shirts made at work last month with the maker of the stuff we sell's product on it, which may as well be a logo for what it is. Same crap. Besides it's under the hand guard, 90% of people will never see it. If it was out past the front sight on the barrel, well..
I get the "don't brag, let the product speak for itself" attitude, but everyone has a logo or a rollmark or something they plaster on stuff, and they all brag one way or another. Ain't no worse than the gunfighter bit or running your shit over with a truck to me, it's all pretty goofy when you really think about it, appealing to the inner-Clint Eastwood/Rambo in us all. PSA bragged about it plenty online and on there site with the FN barrels, I don't know who else uses them(since they don't advertise it I guess).
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