A good option might be these high powered airguns strong enough to drop a moose. Like the .72cal Zeus, it has the same muzzle energy as an AK-47. As long as you can get your hands on lead, you can make your own ammo.
The AR-15 is probably the best all-around anti-personnel weapon ever devised. There's a reason the powers that be want them out of civilian hands.
But yeah, how many rounds do I get to carry?
I think if magic can sustain your modern equipments, there would be a more efficient native way to utilize it. Like the energy to construct and supply bullets to your AK-47 maybe better used as rapid fireball directly.
You might be to essentially use your modern equipment as a store of magic, though. Let's say a 7.62 round takes a minute to produce magically, you now have a machine that can send the output of 10 hours of magic downrange in 1 minute. Even assuming quite a lot of loss, that could be potent depending on how your universe works.
If you know how your equipment works and can find the right smiths, potionmasters, etc you could essentially be carrying the templates for the most powerful items in the realm. Or useless wunderwaffe.
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