http://www.ebay.com/itm/AXC-16-223-5-56-Heavy-HBAR-Rifle-Barrel-1-9-Twist-Carbine-Length-Black/331005749045?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D16802%26meid%3D912018665376028417%26pid%3D100005%26prg%3D7926%26rk%3D1%26rkt%3D5%26sd%3D251311257489%26

now this may not be a good idea.
I have a RRA LEGP that has the pressed on flash hider, and cut off bayonet lug.
I already replaced the pinned stock with a real collapsable stock. (RRA branded).

now I can live with the pressed on flash hider. but I have an itch to get the bayonet lug back and get a bayonet for this gun.
You can't pull the front sight post without getting the flash hider off.
getting the flash hider removed and turned into a threaded barrel for a regular flash hider seems to run around 80 bucks, not couting shipping.

so a new regular barrel for 130 bucks seems like a pretty good way to go.
But I have never heard of these people.