Beretta 391 part ID

[Easttxbowman]

Cleaning my 391 urika last night and looked down and this o-ring was laying on the floor. I had the whole gun disassembled, except for the stock internals. Im 100% certain it came from inside the gun. I've got it all back together and it seems to function fine but this thing obviously goes somewhere.

Anyone have an idea?

[IowaHunter]

Maybe part of the exhaust valve assembly or the valve assembly locking nut? Look at the manual for the schematic.

[Mike1187]

On my extrema2 it goes in the forend

[HuntForHorns]

I don't believe it came from the 391.

[Mike1187]

Here is a diagram, I highlighted the part.

[HuntForHorns]

I have five 391's. I just took one of them apart and couldn't find that oring. It may be in there somewhere but I cant find it.

Is your gun an extrema? They do have the oring.

[Easttxbowman]

Thanks guys, o ring is 100% from the gun and it was ontop of the towel I had layed out. Gun is a 391 urika (not an xtrema or urika 2) ill tear it down again and continue to check.

Didn't think to check a schematic.