What kind of sight protectors, would you call these?? It comes off an Infantry rifle, with no crest on the receiver, but does bear the side rail markings, Budapest 1914. The sight protectors are, like a form of spring steel, which is removable. More detailed photo's of this rifle may be viewed at:Some of the early Austrian conversions had sight protectors added. Both photos are from Manowars' Hungarian Weapons Pages. The first photo (all steel protectors) are two variants of an M31, the brass front sight protector is on one of my Austrian converted M95 rifles.
The altered sling swivels are another matter, but I've not seen anything like what you've described. makes me lean torward an M31...
I'm curious, as the rifle makes me wonder. This is a rifle I picked up several years ago from Century Arms liquidation of the old Springfield Sporter, Inc.