I am not sure if this is what you want. But LubShuttle guns are more expensive and use more expensive cartridges, but they are MUCH better and worth the price in my opinion. If you use them together with a good chuck (like Lock-N-Lube; but I find a right angle chuck can be better for space-constrained applications), it makes a super system that stores without leakage, is easy to use, easy to tell when the grease is exhausted, etc etc.
https://www.amazon.com/dp/B07QDZX3QH?tag=atomicindus08-20
I was getting very frustrated with a small (motorcycle size) gun and an older inherited gun that made a big mess in use and/or in storage for infrequent automotive applications and some yard equipment. This gun is great with no leaks or mess and it really works. You might not want it if you use a big amount of grease (cartridges are more expensive cartridges by a factor of 2 ish and must order online) but for occasional use it gets around many of the annoyances. The variety of grease cartridges is also less for this gun, but they are good quality and enough variety available to cover all usual applications.
I went from dreading greasing to feeling it was no big deal with this gun.
See post #16 in this thread for what I am discussing:
I need recommendations for a new grease gun please. The must have is that I need to be able to reload a new cartridge with one hand without performing a circus trick. I'm standing in the carport and out of anger tossed this pos auto store off the shelf mini grease gun because I'm tired of...
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