There's a big spiel about the fixed line sights in the forthcoming book but not the actual setting up. Because of the sheer size of the book, I had to avoid mission creep like the plague. Incidentally, because of this avoiding mission creep aspect, this book is about the Bren and only mentions the ZB's and ZGB's in respect to the trials. It does touch on the ZB39 (the Czechicon made .303" Bren for want of a better name) but as I mention in the foreword somewhere, if you need to know about that you'd better read something else.