This is a nice, authentic touch — some of the cheap, lightweight muskets manufactured for the Carolina deerskin trade were, in fact, painted blue. Virginia master gunsmith Clay Smith produced reproductions based on Robert Greenhow’s recollection of Williamsburg c. 1775:
“…the youth of Williamsburg formed themselves into a military corps and chose Henry Nicholson as their Capt.; that on (British Governor Lord) Dunmore’s flight from Williamsburg, they repaired to the magazine and armed themselves with blue painted stock guns kept for the purpose of distributing among the Indians, and equip’t as the minute men volunteers in military garb, that is to say in hunting shirts, trousers, bucktails, cockades and ‘Liberty or Death’ suspended to their breasts as their motto; that they could and did perform all the evolutions of the manual exercise far better than the soldiers who were daily arriving from the adjacent counties; that their captain, Henry Nicholson, was about 14 years old.”
There are those who think that Smith’s blue is too light; the actual color may have been closer to Prussian blue, as in the still from Outlander above. I wouldn’t second guess Smith, but in any case it ain’t your “traditional” gunstock.
Some similar guns had vine patterns painted on them. It is well to remember that the 18th century was a flamboyant period — all was not earth tones. So I guess I don’t have to justify loving that wild laminated stock on the Tikka Canadian Ranger Rifle. Trippy stocks have a long frontier pedigree.