You must shoot thousands of rounds per year, be shooting dirty guns, or be shooting some bad reloads to get an unmodified Glock to double feed more than every 2 to 3 years. Not trying to be a Richard, but that taticool stuff is for shooting matches and mall ninjas. Get a Glock 19, factory night sights, some decent ammo, and a couple cans of Breakfree clp, and you will have years of trouble free operation. Glock mags strip just fine on double feeds, of course I have only run about 18,000 rounds thru handguns, most of them being my reloads. The only time tap roll and rack did not work with a Glock is when dummy rounds were used to create a double feed.
I put 3-4k pistol rounds downrange on average every year. That's not alot to me. However, all it takes is one case of crappy ammo to get alot of clearance drills under your belt. While all of the pistols I mentioned above are extremely reliable, they are only half of the equation. I agree with you guys that it is rare to have a double feed in a quality modern handgun. But my point is that it can and does happen. The one in 1000 chance that it could happen is why those baseplates were designed. I don't say that because I'm a fanboy. In fact, I don't currently use them. But I have used the Vickers Glock baseplates and I do appreciate that they are well designed for their intended purpose.If you ever have an issue that this baseplate could solve on a combat handgun, you should be tarred and feathered.....especially on an HK.