Gene, I have read your compleet translation and maybe it is good to change the following : centerfire gun= arme percution centrale.
Coil spring = ressort lames (not ressort a bodin) and also mention, spiral spring= ressort spirale. Handy = manouvrable. Side plates= the only correct translation is Fausses- platines or contre- platines.
J'espre que vous me pardonnerez ces amliorations.
Greetings from Belgium. BTW I write also many faults in English.
Marc.