BudsGunShop.com - Is the BCG full auto rated?

Yes, this is a full auto bcg and will work fine with the rare breeds trigger. As Paul said though I've heard some pretty bad reviews on the rare breeds trigger, of them malfunctioning some as few as 500 rds. Supposedly something to do with a design flaw of a spring. I thought about buying one but couldn't see spending 400+ on a trigger and having it Break a couple magazines later and as far as I know the triggers Don't have a warranty on them. Personally I'd choose to go with a binary trigger, so a bullet fires when pulling and releasing the trigger. Again the frt trigger sounds amazing and once they work out the design flaw I'd love to buy one if they're still around. If you do buy one you'll have to let us know how it goes. Good luck and hope this helps.

Yes it is a full auto BCG

Emilio, no issues here with the Ruger AR-556. The Full Auto BCG of the Ruger AR-556 is machined from 9310 alloy steel and is shot-peened and pressure (proof) tested to ensure strength, structural integrity and durability. The gas key is properly staked so that it will not loosen after any amount of firing. Additionally, a matte black oxide finish on the exterior of the bolt carrier provides corrosion resistance.

Forgot to add for the RA535 recommend a low mass BCG, as it cycles more reliable and quicker, RA sells their own that they recommend for use with the RA535

Yes this BCG will function well with your FRT.
I am also been looking at after market triggers
I've seen some quality control issues with the Rare breed trigger
FRT15 (forced reset) but its supposed to be amazing when it works.
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The other 2 I'm looking at are not FRT but pretty high quality and extremely fast are the Rise Armament RA535, AND the TriggerTech Diamond .