Another endorsement for the Uplula. I keep one at the house, one at the cabin, one in my truck, and one in the pistol shooting bag. Then there is an itinerant loader that occasionally pops up unexpectedly. I didn't plan on buying so many but after misplacing or forgetting them, I eventually ended up with enough to cover most occasions.
I also have them for M1A and AR-15 mags, there might be better ones but these work pretty well for both filling and topping off mags.
