I built the lock from The Rifle Shoppe #505 cast parts over about a year of fussing, filing, and fitting. Not to mention spring tempering, screw-making, tapping and threading. This was my second miquelet project, and now that I am officially retired it is making good progress. I have built at least 20 other locks from rough castings the miquelet is no more difficult than regular flintlocks, maybe a tad easier.
In general, miquelets are good sparkers if the frizzen is correctly hardened. The Rifle Shoppe's frizzens are the perfect alloy to harden correctly. I use recycled flints in my miquelet and Jacobian locks because I am cheap, and they work fine. With this one, I added a roller on the cock-toe because it was a bit "lazy."
Having become a genuine Floridian, and a historian, I have been aware of the Spanish influence on my State's history. Unfortunately, the period correct miquelet muskets and escopeta of the two Spanish colonial periods are not available as reproductions. So, I built my own.
I am down to ramrod pipes and stock finishing. Would you like me to post pictures of my progress or the finished blunderbuss?