I know there is various opinions in Spanish guns and the quality of the Steel used and/or hardening processes. Many opinions concerning this are not good.

I see Belgium guns that appear to be very nice from makers such as Francotte, Bury, Defournay, Lebeau-Courally, etc. Have there been concerns about the Steel or hardening of parts in the better known Belgium Makers? Seems like an alternative to Spanish guns albeit at a higher price. Heck of a lot more reasonable in price as compared to English guns though.