I have a 111 in a 7mm Rem Mag, with detachable box mag which sits flush with the bottom of the stock and only hold three rounds, im looking for an extended mag(6-8 rounds) and im not having any luck. Making my own is a last resort but still an option, does anyone know who sell/makes them. Also i noticed that my mag is stamped for 7mm rem mag and .338, ive seen extened mag for the .338 will one of those fit my factory stock?