A quest has finally ended; after decades of looking, I found that this case fits my needs exactly. I own a few of them already and will be adding at least a couple more in the near future.
I am a KISS kinda guy and organizing "pistol stuff" is easiest for me when I am able to keep all related parts and accessories with the intended pistol. E.g., mags for the Colt Defender will not work in a standard Government Model 1911, mags for a 1911 .38 Super are not for use in a 1911 .45 ACP ... you get the idea. For the guns I use most often at the range (or for traveling), I like having everything set to go in readily identifiable GAG (Grab a Gun) Bags.
The main storage compartment is rather cavernous, doncha think?
The Wilson pistol case has two spacious exterior storage compartments that provide more than adequate room for housing dedicated tools, more mags, more ammo, spare grips, spare parts and springs, blah blah blah ...
A Colt Defender has a proprietary recoil spring assembly (with a relatively short life); I keep a goodly supply of them in the Colt Defender GAG Bag.
These 15# 1911 Government Model recoil springs are in the .38 Super GAG Bag.
Yes, this case works wonderfully for pistols with big ole double stack mags like the Beretta 92 ... and my Glock 19.
EDITED TO ADD 12/04/2020:Over time I've put more than a few of these cases to good use. First off, lemme state that NO PISTOLS ARE STORED IN THESE CASES, ALL GUNS (except what I am carrying) ARE LOCKED AWAY IN HARD SAFES. Each case is a kit for a specific pistol that sees regular range and / or travel use. Choose a pistol from the safe and match it to the designate kit and then hit the road or the range.
DISCLAIMER: As always at this blog site, this product review is simply a good old-fashioned campfire chat; this is not an opinion on what I feel you should or should not purchase or what you should be using. What does or does not work for me could be many country miles away from your tastes and needs. All products I review for this blog are purchased at retail price by me. I do not accept payment, discounts, "freebies," products on loan, demon alcohol, drugs, probation, parole, Presidential Pardons, or sexual favors for doing any review.