2 ways to do it.......
1. SHORT WAY
-get a small allen wrench that fits inside the hole of the broken barb.
-put a drop of superglue on the allen wrench
-insert allen wrench into the broken barb
-let it dry for a while, then twist it out carefully
2. LONG WAY. IF METHOD 1 DOES NOT WORK
Take the ram sleeve out.
-take bolt out of gun
-take gripframe off of gun
-remove the hose barbs on teh ram sleeve
-there's a set screw under the eye covers (approximately) and you need to remove that
-your ram sleeve will then come out
-using the ram sleeve cap as a grip, pull it out.
Then unscrew the ram sleeve cap from the ram sleeve.
Take the ram out (should slide right out).
Here's how to get the broken barb out......screw it right into the ram. You can use a small screwdriver, or take another hose barb and screw the hose barb in, it will push the broken threads from teh old barb into the ram sleeve. Shake the ram sleeve until the old threads from the barb fall out. You're all set then, well after you reassemble it
Hopefully this helps.