Can anyone tell me much about Parkerized rifle sling swivels? I got a Creedmoor 1 1/4" cotton GI military web sling the other day & it has a grayish kind of rough finish to its metal parts. I'm guessing this is what's called Parkerized. It has a flat 1 1/4" metal spring clip that QDs from the butt swivel & I'm figuring it would rub the blue off a reg. swivel in no time. Can anyone recommend a Parkerized swivel set? Thanks.