Sentry .25 question

[tennx]

I went to shoot my sentry today and noticed a ever so slight puff of air coming out the back of the breech…not that familar with gun…I cover hole with thumb and fired a shot no puff….any ideas…

Many thanks

[Wayne52]

Sounds like a bad probe o ring to me

[tennx]

Sounds like a bad probe o ring to me

Not arguing ….but oring looked good….the air seemed to come out of the very back of gun  ,not the chamber area…suppose I could do tissue test…
Pic added to original post
Thanks for reply

[tennx]

I just did the tissue test…slight movement @ bolt…blew tissue off gun at the back…

Gun does not leak down


Could poppet be leaking into end of air chamber…with hammer strike

[tennx]

Ok if no one can help original ?….can someone tell me best way to degas….I guess Im going in…lol

[Back_Roads]

 Shoot it down, or unscrew the air gauge. I just shot mine, there is a slight puff og air back there, but not enough to blow a tissue away.
 I suspect a plastic piece that is over the valve stem, one would not have to degas to get to that part.
 I can see if I can dig up the EPV.

[OTmachine]

Will this help

[Back_Roads]

 Hard to see the part numbers, but I think it is #38, plastic piece with a Phillips screw, has been known to work its way loose, part is right behind the valve / valve stem.

[tennx]

       Backroads and Otmachine many thanks
.while I might have your attention any source of parts besides FDAR…I know u folks like mr. Mike and no disrespect intended….but the only times he answers MY EMAILS is when Im spending money…lol

[Back_Roads]

   Thanks  guys..while I might have your attention any source of parts besides FDAR…I know u folks like mr. Mike and no disrespect intended….but the only times he answers MY EMAILS is when Im spending money…lol

 Wayne says call, between 9 am and 11 am CT, seems to work for him

[tennx]

   Thanks  guys..while I might have your attention any source of parts besides FDAR…I know u folks like mr. Mike and no disrespect intended….but the only times he answers MY EMAILS is when Im spending money…lol

 Wayne says call, between 9 am and 11 am CT, seems to work for him

Im thinking long term reason I asked about parts…from your description this maybe fixable in-house….at this time…gun has not been shot that much so may as u mentioned loose screw…to be honest I may just let it bump…but good to know these things…..many thanks

[tennx]

Ok talk to Mike….he says check all the o-rings ,barrel,probe.tp…etc…he is the professional and didnt want to argue but I dont see how any air from those areas could get to back area of air tube….oh and he said no way the disc spacer between valve and hammer….he dont answer my emails….but nice guy to chat with…we agreed just shoot the dang thing…..lol