Years ago I had the priviledge to work in a public library and had access to books not often viewed by the general public. While examining my M40 I noticed the front of the trigger guard was scalloped unlike the blocked versions found on my duty G22. This reminded me of a gunsmith book I read. There was a gunsmith/gunfighter named Fitzsimmons years ago that modified revolvers for practical use. In the quest for speed, the extreme was to completetly cut off the front of the trigger guard altogether. For those looking for something less radical,he scalloped the right or left side of the front of the guard . His thought from experience at the time was that this modification gave him more speed getting his finger on the trigger. I compared the M40 to the G22 and felt just the slightest difference when sliding my finger to the trigger. This may not have been the intent behind the guard on the M40, but it just seems to be another feel good point about this gun in a 'working gun' perspective.