Smith & wesson model 77A air gun

[jabberwoki]

Grabbed a perfect condition  dare i say it never fired example of one of these.
It functions ie cycles perfectly but builds no pressure , i`m thinking the rubber seals have not aged well.
Anybody know a good air gun rebuilder?
Looks just like this one.

[pep]

HYD fluid could soften the up without dissembling.

but if not
https://www.bakerairguns.com/shop/parts/seal-kits/

[jabberwoki]

Yeah I emailed them. Did watch one rebuild vid seems a little technical tho.

[hickory n Steel]

Grabbed a perfect condition  dare i say it never fired example of one of these.
It functions ie cycles perfectly but builds no pressure , i`m thinking the rubber seals have not aged well.
Anybody know a good air gun rebuilder?
Looks just like this one.

Northwest airguns does good work, so does Tim Macmurray at mac1 airguns but I'm not sure if he works on the S&W's.
You could always do it yourself,  it shouldn't very hard.
I have never seen a 77a in person let alone been into one but there's not too many ways to make a hammer fired pneumatic valve.
I did a S&W model 79g pistol awhile back and it was extremely simple, but it's a Co2 gun.

One of the coolest things about the S&W airguns is that they are real Smith and Wessons, manufactured by them.
Btw you should try giving it some SAE non detergent 10w30 and see if that revives the seals, if it starts to build pressure but leaks try standing it upright in a corner for a few days with some isopropyl alcohol and running it to flush it out then re oil and see what happens.
Don't use gun oil or anything like that.
If it seems to be unfired it might just need oil.

I just got this 1962 Crosman model 400 repeater in today that I'll be resealing here soon.

[pep]

Yeah I emailed them. Did watch one rebuild vid seems a little technical tho.

Not for you, I am sure, went looking for some sort of paper (WEB pg). Showing pictures of the internals, or possible assembly.

Never having dealt with a pump air rifle, limited idea wise came up with nada.

That is a fine piece, I can tell you that.

[hickory n Steel]

The action inside the receiver is a little different,  but beyond that it's relatively standard multi stroke pneumatic action.

A piston, a hammer, and 2 piece valve with a poppet in one end and a valve check in the other.

It looks like Baker airguns doesn't have a seal kit for the 77a, and I'm not sure who does.

[fatfillup]

Knew H&S would have some good thoughts

[hickory n Steel]

One of the problems with a lot of vintage airguns is the valve poppet around the valve stem,  usually they're brass with a quad ring inside ( a flat O ring with a groove in each side ) and it's hard to replace that without knicking the brass.
Because of this usually seal kits are supplied with an aftermarket poppet that is made of delrin.
Some places will rebuild them because they can reface them,  but those places require you to send in your valve poppet when you buy a rebuilt one from them.
I don't know of anybody making or rebuilding the valve poppet for the S&W 77a.
I bought a kit with an aftermarket poppet for my model 79G pistol a few months back, but even the pistols which are far more common don't have a lot of parts support.