u/kaewon · 2025-06-28 22:43:17 UTC · score 2

If you have the 556 conversion bcg then you can use a 556 barrel. Or if you want to use a 22lr barrel then you will need to buy the 22lr collar. 556 barrels are cheaper but accuracy won't be good with the twist rate.

They sell dedicated 22 bcgs so you don't have to buy the collar separately and also sell barrel combos to get everything you need for cheaper. I know that's too late for you since you already bought it but for anyone else or if you ever build another, buy the combos and save some money. Rtb is the cheapest place I know.