Hi Everyone,
New to AR builds here, just trying my first one, appreciate any advice. My question is:
Is the 80 percent arms end mill bit worth it for the 5d Tactical Jig, Gen 2?

The reason I ask is I bought the full .308/AR-15 Jig gen 2 and didn't notice that it did NOT include the end mill bit for the router this one:
https://www.80percentarms.com/products/5-16-hybrid-end-mill-for-gen-2-easy-jig

Little annoying. Why not offer to sell it to me on the website? Hell include it I probably would have paid extra, ugh.  Anyways, it seems really overpriced for a carbide router bit, realistically should only be $8 to $12 max.  Did some research, and there were a few complaints that it only lasted through 1.5 lowers, not even 2!  Now this just may be people that aren't using lubricant while cutting or maybe they are not that good?   What do you folks think?

Am I better off with something like this, that has Zrn coating that lasts longer supposedly?
https://www.americangunsmithtooling.com/products/5-16-3-flute-1-2-loc-3-75-oal-zrn-coated-carbide-end-mill
or are the better alternatives?

Thank you folks!

Having used both, go with the AGT bit.  More use, better finish.  Use plenty of cutting fluid.

To add to this, they make 3 different kits depending on the model of your router.

I just finished my third lower using the 5DTactical jig. I also used the Pro Jig Tool Kit as referenced/order at https://www.5dtactical.com/product-p/5d-fbk.htm

So far I've had no problems. It's been a pretty easy process and I've been very happy with the results.