Conversion to 300BLK

Hey there
Just after suggestions regarding converting a N.E.A .223 Upper into 300BLK ?
What components would I require and would you recommend(and cost)?
Thinking about doing this as a bit of a project ... or would I be cheaper to just purchase a 300Blk Upper

Thanks in advance

Seano

All you need is a 300blk barrel,and possibly a new gas tube if you change gas system length.

I can sell you a new Daniel defence 16" 300blj barrel that uses a carbine length gas system(what I think you have now) for $500.

That a lot cheeper than a new upper