http://www.spudfiles.com/forums/hop-up-t11238.html
and noname commented
there we go so i guess thats how he did itAll you need to is cut a tiny slot in the end of your barrel (perpendicular to end of barrel, about 1 cm from the end) and put an O-ring in it. It works great, and replacement O-ringas are only like $0.10 at that size.



