The ca 1930 BURGO catalog shows a full-stocked big-bore rifle, very similar to the Peterlongo one. Ex-military action, full octagonal ribbed barrel, full length foreend fastened Sul-style by wedges. IMHO both Peterlongo and Burgsmueller got these rifles from the same source in the Suhl/Zella-Mehlis guntrade, perhaps Schueler?