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80 percent lowers are available through most online gun parts distributors like brownells, midwayusa etc. You still would need a mill and drill press.
Please perform safety checks before firing if you are going to build your own, 223 exceeds 40,000 PSI pressure in the chamber when fired

thanks.
Can I order these into Canada?
any idea where?

Do you have a link for 3D printing ?

80 percent lowers are not considered guns here, sorry I have no idea what Canada considers legal. I don't know where you can get a 3d printing file.

Can you sell me lowers and provide instructions to build one?

I can't, but I found a link to a company that can probably answer the international question as well as sells lowers and jigs to finish them
https://www.80percentarms.com/collections/80-lowers

no problem, please make sure you check your local laws before ordering even in the United States the laws can be different depending on the city or state

🍁 I just did a new post 🍁

Add a new entry daily to the draw 😜

the point is that you don't BUY one. You MAKE one. lol