If the attacking creatures are felons Kyle can use the ability without tapping.

Add in a “reload” enchant creature that costs X and reads “Reload comes into play with X magazine counters. Remove a magazine counter; tap enchanted creature: add 5.56 counters to enchanted creature until it has 30 5.56 counters”. Then when Kyle is running low you just reload before your untap phase.

If you really want to minmax here you can also add an enchantment “rule of law” that reads “whenever a creature attacks, it gains the felon subtype until end of game. Whenever a creature deals damage to a player or another creature, it gains the felon subtype until end of game unless the creature it damages is attacking. Whenever a creature destroys or removes from game another creature, it gains the felon subtype until end of game unless the destroyed or removed creature was a felon.”