Help on changing outer barrel on KSC M93R System 7 full metal

Would appreciate pointer on removing the inner barrel/hop up from the outer barrel.   See the picture enclosed, I can't seem to get the inner barrel/hop up to come out and I can't seem to find any pin there locking down the inner barrel.  What's the trick pls?




[ 本帖最後由 Alecela 於 15-12-2013 12:58 編輯 ]