Yes Sir and this one is still fairly current and most of the ones I run into, are in kit form. If you look closely and I could be wrong, the lettering looks to be laser engraved. They will shoot !! ....
As Blunderbusses go, it has a narrow bore. .54" is about 28 gauge (IIRC). Historically, BBs were 12 gauge or larger.
This one here is about 14 gauge...flintlock as were most of them back in the day....and with a 14" barrel, a hoot to shoot.
Pete
There is a fair bit of misinformation in that advertisement from the catalog....Reference to conical bullets...accuracy would be very poor. Citing the flared muzzle as a way of increasing the spread of the pattern. The flare has nothing to do with the size of the pattern, only with ease of loading on a moving platform like the deck of a ship or on a stagecoach in the Scottish borderlands; it will pattern like a cylinder bored SG.