JM J8 Barrel Instal

Just a quick one guys. I’m putting a new barrel in the M
4. The old barrel is held securely but the new one easily pops out of the T piece. Is is supposed to be glued into the T piece or is it meant to be loose and easy to pull out?

It is common to have to glue them into place.

Some come with orings

Some need wrapping in PTFE

Superglue or epoxy is your friend

Thanks zeHamish I’ll seal the tip with thread tape then run a bead of glue around it.