One of my first experiences as an expert witness in muzzle loader failures was with an Asian Indian made blunderbuss, sold by Navy Arms. Val Forgett appologized, he did not realize they made then that badly.
The shooter was firing blanks, consisting of about a 12ga shell full of black powder & generous newspaper wadding.
Breechplug came out and sailed, fortunately, past his head.
Metal OK. Very fine threads with almost no engagement. Not so good.
Even if you do not like having your own two eyes, I would urge you not to get an Indian muzzle loader.
I like this one, albeit for hanging on wall only.