The GPR I was referring to in Post 23 was made after the 2017 recall, in mid 2018, not 10 or 20 years ago. I wasn’t complaining about the Lyman Investarms GPR, just stating my personal observations as OP requested. Perfect, no. But at their price point a pretty good deal. Dependable (after a bit of tweaking, just part of the game today) and accurate. Spend three or four times as much, not such a good deal. Nothing to be gained bashing Lyman until they exit the traditional muzzleloader, at least in my opinion.
Although you referenced an issue with the factory nipple and vent, guessing you were referring to a vent liner, as you said a replacement vent from RMC resolved the issue. Curious what the problem was with the factory vent liner? I have had to enlarge the hole, chamfer the powder side of the vent and shorten the overall length of Lyman’s and other manufacturers liners, including RMC’s, but have found most to be serviceable. Just part of setting up a flintlock that uses a removable liner in my opinion.