I might give it a try, but I can't help wondering why, if I'm going to look at the back of the firing pin, I don't just use my usual flash sight picture. Let's all remember what "flash sight picture" means. Here's how Greg Morrison describes it (Morrison, Gregory, The Modern Technique of the Pistol
, Gunsite Press, 1991, pp 87 - 88, emphasis added):
...The flash sight-picture involves a glimpse of the sight-picture sufficient to confirm alignment....The target shooter’s gaze at the front sight has proven inappropriate for the bulk of pistolfighting. However, the practical shooter must start at this level and work up to the flash, which becomes reflexive as motor skills are refined. With practice, a consistent firing platform and firing stroke align the sights effortlessly. This index to the target eventually becomes an instantaneous confirmation of the sight-picture.
...Using the flash sight-picture programs the reflex of aligning the weapon’s sights with the target instantly....There is good reason for sights: one needs them to align the barrel with the target reliably....