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Be aware that because someone else says they don't need to crimp doesn't mean that you don't need to crimp.
The chambering action of the AR can cause the bullet to be driven deeper into the case when the bullet tip hits the feed ramp. It can also cause the bullet to move forward in the case as the case stops suddenly and the inertia wants to pull the bullet out of the case just like an inertia bullet puller.
What I would suggest you do is to know your overall length. Try some without a crimp. Let the firing action chamber a round you know the length of. Pull the bolt back and catch the round before it hits the ground. Measure the length and compare that with the bullet OAL you have recorded. Doing this several times will tell you if you need to crimp for your particular setup.
The reason you can't rely on other folks experience is because your brass, your bullets, your sizing dies, your techniques can be different and that "could" affect neck tension. Different brass can have differing neck thickness.
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