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A wheellock rifle, German, dated 1640. Lightly swamped barrel with seven groove rifling in 16 mm calibre, dovetailed iron sights, and "1640" engraved on the breech. Cut wheellock with a cloverleaf design
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Original 17th Century German Percussion Converted Rifled Coach Gun wit – International Military Antiques
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James bond style gun barrel rifling with blood vector, Art Print | Barewalls Posters & Prints | bwc86009003
![File:Barrel Rifling Borescope wear copper fouling Enfield No4 Mk1 Longbranch.jpg - Wikimedia Commons File:Barrel Rifling Borescope wear copper fouling Enfield No4 Mk1 Longbranch.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/0/06/Barrel_Rifling_Borescope_wear_copper_fouling_Enfield_No4_Mk1_Longbranch.jpg)