Krag rifle stock

They all had a sling swivel set up.
The 1895 Mt Carbine had an eyelet set into buttstock at bottom and, sometimes, pined through sides, plus front left side at band. The original Lang Krag had a sling seivel at butt bottom like most rifles and bottom of centre band. The 1912 Carbine had inletted at butt as 1895 or an eyelet at TGuard along with front left of stock band.
There are other less common models, but I think you saw what was a rear sling swivel's eyelet in the rear stock.
 
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