This forum is set up for traditional muzzleloading firearms that were in use up to the year 1865 so the modern looking in-line guns are not included. In fact Forum Rule #7 says quite clearly,
"7.
We do not discuss modern (in-line) muzzleloading firearms.
Early historic breech loading guns that do not use primed metallic or semi-metallic cartridges and meet the requirements of rule #1 are permitted for discussion.
See special rules at the bottom for posts about breech loading firearms."
The forum also does not allow discussions about certain types of ammunition for the same reason.
"9: We do not discuss copper and/or jacketed, plastic/polymer tipped bullets, sabots, power belts, or other 'plastic-wrapped' bullets. Smoothbores using plastic wads and steel shot are an exception to this rule."
As a side note, there was a time when discussions of In-line guns was permitted on the forum. Because of the all out war's that developed between the traditional hunters and the in-line hunters, the forum owner decided he'd seen enough so an all out ban on in-lines was created.
The new forum owner agrees that this forum should stay as it is and limit the discussions to firearms and reenacting suitable for the time period of 1865 and earlier.
The new forum owner also owns a muzzleloading site set up for modern guns if your interested. It is quite similar to this forum.
Here is a link to "Modern Muzzleloader" if you want to talk about your Knight in-line or any other firearm that they allow.
https://www.modernmuzzleloader.com/
I should add, the forum has a "Non-muzzleloading" area where discussions of modern guns and politics are allowed. To use it, you must pay a $18/year fee to become a "MFL Supporter". Although an in-line gun discussion might fit into this area, if any heated debates came from it, I would remove the topic based on rule #7.
