Older Crosman 760. Need info please.

[Quick Cal]

I just got this the other day for $25. But I think it might have been pieced together. Not sure. The receiver sides were barely screwed together, and the stock was about to fall off. It was missing a bunch of parts.

It has the flat head pump piston, and the early style compression chamber. It has a serial number on the bottom of the receiver. But according to Crosman if the serial number starts with a 0 which mine does, it's not a date code.


My serial number is 04245425. It does not have a gold trigger. Did the 73?  Could this still be the correct receiver for a 73 gun? My end cap is stamped 93. Maybe it has been changed? What year should I call this thing? A pre-75,,,,lol.

When I got it, it had a bolt for the forearm roll pin. It did some damage the the airtube and linkage. Everything is all wallowed out. I put a bigger roll pin in. But this made it where the forearm would not close all the way. But I think the pin was sitting in there crooked maybe? Or the pump piston needs adjusted? More on that in a bit.

I do have an upgraded roll pin on the way that has the screws going through the sides. I'll see what happens with that. But I'm worried my holes are all elongated and I might have issues? Do you guys have a go to method to fix this?

I also got a rebuilt flat head piston. I hate to even mention it, but I need to make sure this won't hurt anything. It has a gouge in it from being worked on. I think it must be ok or they would not have shipped it?

Now I need to install the pump piston. Do you guys think I have to many threads showing and this is why the bigger roll pin would not let the forearm close? It was like this when I got it. I assume this should be adjusted? Is the flat head supposed to touch the face of the compression chamber? Is there supposed to be a gap? What is the proper procedure for this?  Is there a write up or video for it?

I guess that enough for now,,,lol. Thanks for any info or help.

Pics on the way.

[Goose]

Welcome!

I'm the guy that's been responding on that other board.    Glad to see you here where things aren't so springer oriented.

Screw the pump-cup assembly in a bit and it should close just fine.  You want enough cam-over to keep it closed.  Lube everything well as you assemble it.

I'm curious about the oversize pin.  Should you run out of options, I have a spare tube, pivot and pump-arm that are all in serviceable condition.

Luck,

J~

[threesuns]

September 73 barrel band. April 74 clam shell. “O”ctober 74 clam shell. There are more than $25 worth of parts there.

Adjust the cup till the pump arm is about 3/4 inch from the tube when it just touches the valve, that should be just about rite for proper cam over. 

Enjoy 😃

[Quick Cal]

Welcome!

I'm the guy that's been responding on that other board.    Glad to see you here where things aren't so springer oriented.

Screw the pump-cup assembly in a bit and it should close just fine.  You want enough cam-over to keep it closed.  Lube everything well as you assemble it.

I'm curious about the oversize pin.  Should you run out of options, I have a spare tube, pivot and pump-arm that are all in serviceable condition.

Luck,

J~

Yup. I figured that was you.

[Quick Cal]

September 73 barrel band. April 74 clam shell. “O”ctober 74 clam shell. There are more than $25 worth of parts there.

Adjust the cup till the pump arm is about 3/4 inch from the tube when it just touches the valve, that should be just about rite for proper cam over. 

Enjoy 😃

Thanks for the info.

So do you think the gun is all original? Or is it still a pieced together?

[threesuns]

Crosman only list stock materials as the difference between the 3 variants manufactured between 1971 and 1977. Given the millions of 760s sold over the years, would Crosman match mixed pieces just to sell 1 more of their most popular airguns? After almost 50 years we may never know for sure.

[bantam5s]

September 73 barrel band. April 74 clam shell. “O”ctober 74 clam shell. There are more than $25 worth of parts there.

Adjust the cup till the pump arm is about 3/4 inch from the tube when it just touches the valve, that should be just about rite for proper cam over. 

Enjoy 😃

Thanks for the info.

So do you think the gun is all original? Or is it still a pieced together?

Generally the serial number date codes aren't supposed to have started till July of 1975, but I have one that is definitely dated April of 75 with a 475 SN and 45 cap stamp.
I know for a fact the SN date codes started before the info on their site claims,  but I do not know just how early they started it.
I could turn up no examples online of a pre '75 gun with a definitive date code SN matching a pre '75 cap stamp.

This definitely has the correct solid styrene furniture and blued flat steel trigger for a '73 gun, I would say this is a September of 1973 gun and the receiver which is likely original just has a plain SN.
That's just my assessment,  but maybe somebody knows something I don't.

I do not know what to make of that 4 4 stamped on the side though,  it's a new one on me for sure.

[Back_Roads]

 The 4 4 stamp could possibly be a Crosman warranty service date stamp

[threesuns]

Didn’t think of that and could explain the other serial number too.

[Quick Cal]

So what variant would this be considered?

[Goose]

So what variant would this be considered?

A 3/4/5 gen?  The first gen had wood furniture, a square tang groove and no dovetail.  Then they added a dovetail and round stock-tang (2), then they went to the plastics that you have (3), then to a wood forend on the pump handle and butt-stock like yours (4), then to serial numbers on the side of the receiver (5).  I haven't tracked them after that because they added too much plastic for me to be interested.

More info here if you want to look- https://support.crosman.com/hc/en-us/categories/200223634-Owner-s-Manuals-and-Parts-Diagrams

I think yours may be an ultra-rare factory-franken.  I've never seen one like it.  Is the barrel rifled?

J~

[threesuns]

Reminiscent of Johnny Cash’s Cadillac. Its yours and priceless! 🙃

[bantam5s]

So what variant would this be considered?

A 3/4/5 gen?  The first gen had wood furniture, a square tang groove and no dovetail.  Then they added a dovetail and round stock-tang (2), then they went to the plastics that you have (3), then to a wood forend on the pump handle and butt-stock like yours (4), then to serial numbers on the side of the receiver (5).  I haven't tracked them after that because they added too much plastic for me to be interested.

More info here if you want to look- https://support.crosman.com/hc/en-us/categories/200223634-Owner-s-Manuals-and-Parts-Diagrams

I think yours may be an ultra-rare factory-franken.  I've never seen one like it.  Is the barrel rifled?

J~

Officially a 2nd variant according to Crosman,  but by my count I'd call it the 6th or so variant.

They started with the smooth top dark grey receiver, square tang ,gold colored trigger, and wood furniture / tootsie roll forearm.
Went to a black receiver , round tang,  same trigger and furniture.
Black receiver,  scope rail,  blued trigger, same furniture.
Then the forearm changed from the tootsie roll to a smooth rectangle with a fuller along either side.
From there on to this variant and a bunch more after that, there are loads of variations to be found because Crosman didn't waste perfectly good parts.
This thread has some good info in it.
https://www.gatewaytoairguns.org/GTA/index.php?topic=191392.0