look at offerings from toolcraft or microbest. They make bcgs for most of the major retailers.
From SOTAR:
Why you should avoid Nickel Boron AR Bolt Carrier Groups
In my experience, Nickle Boron (NiB) is an inferior coating for the AR Bolt, Extractor, and Carrier. It's a downgrade on all...
you think that's tempting? for $120 more you can get it with Geissele SSA trigger and MBUS Pro sights :)
https://www.familyfirearms.com/product/daniel-defense-ddm4-v7-16-32rd-exclusive-w-geissele-ssa-trigger-magpul-mbus-pro-sights-ergo-rail-panels-webgb-1122-2
https://ar15discounts.com/products/anderson-stripped-lower-receiver-no-logo-3-pack/
orders over $150 ship free, so find a $20 item to get you to that threshold.
also make sure your FFL charges per sheet and not per item.
https://www.familyfirearms.com/product/daniel-defense-ddm4-v7-5.56-nato-16-301-black-hard-coat-anodized-6-position-wsofttouch-overmolding-stock
Add to cart for discounted price
If anyone picks this up I have a brand new vortex cantilever mount for sale
https://www.theoutdoorstrader.com/threads/fs-vortex-sport-cantilever-30mm-scope-mount.2988429/