Raw .357 BROKE makes huge noise and air shoots out back now !

Ok, took the raw .357 out for a shoot. First pellet .357 bang really loud pop right in my ear. After I shook that off i noticed every shot after that the rifle was shooting a blast of air back in my face along with the pellet going out the front. That said, it was way louder.

Anybody know what that is? I have not opened up any of the action or really looked at it since last sunday. I just put it back in the case and shot my other guns. I am thinking some seal or O ring broke out.

Any help would be great ? Monday morning put in a service email to RAW but 5 days later no reply. Sad, makes me feel a bit curious on wanting support work with a gun that costs 2K plus. 
Any help would be great?

Jay
 
Yep, that would be my guess also ... I do not own a RAW ... YET! ... but every time I ever blew out a barrel oring on my Wlldcat or my Marauder it sounded like a shotgun blast. Just open up the breach and take a look inside the rear of the barrel to see if that oring is still inplace. On my Marauder or the Wildcat I simply push a dowel rod through the muzzle to about where the oring is supposed to sit and then put an oring in the back of the barrel and work it around until it sits in it's groove. The dowel rod will keep the oring from getting pushed too far down the barrel .if it misses the groove. Put some silicone grease on the o-ring first.