Toolcraft promotes this right on their website. Also, IIRC, IG said they made Sionics.
Toolcraft is a .mil supplier and their carriers and bolts both have NSN's.
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If you want to go the Toolcraft route the complete BCGs sometimes go on sale so cheaply you might as well just grab one of those and have a spare bolt, firing pin, etc
https://www.righttobear.com/Mil-Spec...ey-p/phclc.htm
Edit: emailed RTB to confirm that these are AO Precision carriers OP
Bolts break, carries don't.
The bolt is likely the weakest part the AR15.
Bare carriers are pretty easy to find, but price wise they are a terrible value proposition compared to a full BCG.
I would agree. https://www.joeboboutfitters.com/Too...auto-011bn.htm
Cheers, Steve