I've noticed a lot of guys asking for recs with strong friendship cores, and honestly, a lot of the usual suspects feel a bit shallow to me. The 'band of brothers' trope is everywhere, but real depth comes from friction and vulnerability, not just shared battles. Have you read 'The Lies of Locke Lamora'? The dynamic between Locke and Jean is everything. They're basically con-artist siblings who bicker constantly, have completely different moral compasses at times, and would literally die for each other without a second thought. The loyalty isn't spoken; it's in the way they move around each other, covering weaknesses, knowing exactly when to push and when to back off.
A more contemporary, grounded pick would be Stephen King's 'The Body', the novella 'Stand By Me' is based on. It captures that specific, fleeting moment in boyhood where your friends are your entire world, and the journey is more about testing those bonds against the outside world than any actual destination. The dialogue feels authentic—the insults, the bravado masking fear, the unspoken agreements. It gets the messy, imperfect heart of male friendship better than any epic fantasy quest.