GTA
Airguns by Make and Model => Daisy Airguns => Topic started by: cobalt327 on April 16, 2019, 04:31:34 AM
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I just finished putting an 880 together using a 2004 valve body/bolt/barrel/trigger assembly into a 1982-‘88 metal receiver. The VB assembly is the same as the current 880. This type of receiver has an open loading port, stock screw on the right side, separate trigger guard, and no warning/instruction billboards cast into the receiver halves. Judging by what I've read, a receiver with the RH stock screw seems to be easier to use than the earlier closed loading port/LH stock screw receiver.
To fit the late model VB/barrel assembly to fit the metal receiver, I removed a mold parting line on top of the VB above where the leade is and clearanced a small area at the bottom of the receiver as well as the end of the exhaust valve stem and retainer clip to give the exhaust valve room for full travel. Other than that, I ran into something that I don't recall being mentioned before so I thought I’d document it here in hopes that it'll help someone.
The new style bolt has a larger diameter probe and an O-ring to seal it to the leade. The metal receiver 880s used a smaller diameter probe and the right side receiver is made to fit the small diameter probe very closely. So when I cycled the bolt I found it would work, but it was binding and the bolt action was far from smooth. After I looked closely I found the difference in the metal casting compared to the plastic one. I measured the new style probe and found it to be 7/32”, so I looked through my cratex points and found a lightly used 1/4” and used it to match the casting to the probe. The difference in the bolt cycling was dramatic- went from stiff and balky to smooth and easy just like it should be.
Bolt comparison (not my photo)
(https://i.imgur.com/IaqzrGR.jpg)
Clearance for new bolt probe
(https://i.imgur.com/L3ulEk1.jpg)
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Ahh Interesting... Good info...
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I just finished putting an 880 together using a 2004 valve body/bolt/barrel/trigger assembly into a 1982-‘88 metal receiver. The VB assembly is the same as the current 880. This type of receiver has an open loading port, stock screw on the right side, separate trigger guard, and no warning/instruction billboards cast into the receiver halves. Judging by what I've read, a receiver with the RH stock screw seems to be easier to use than the earlier closed loading port/LH stock screw receiver.
To fit the late model VB/barrel assembly to fit the metal receiver, I removed a mold parting line on top of the VB above where the leade is and clearanced a small area at the bottom of the receiver as well as the end of the exhaust valve stem and retainer clip to give the exhaust valve room for full travel. Other than that, I ran into something that I don't recall being mentioned before so I thought I’d document it here in hopes that it'll help someone.
The new style bolt has a larger diameter probe and an O-ring to seal it to the leade. The metal receiver 880s used a smaller diameter probe and the right side receiver is made to fit the small diameter probe very closely. So when I cycled the bolt I found it would work, but it was binding and the bolt action was far from smooth. After I looked closely I found the difference in the metal casting compared to the plastic one. I measured the new style probe and found it to be 7/32”, so I looked through my cratex points and found a lightly used 1/4” and used it to match the casting to the probe. The difference in the bolt cycling was dramatic- went from stiff and balky to smooth and easy just like it should be.
Bolt comparison (not my photo)
(https://i.imgur.com/IaqzrGR.jpg)
Clearance for new bolt probe
(https://i.imgur.com/L3ulEk1.jpg)
Mark,
remember I had all kinds of trouble last fall(got a M/M off of Ebay) after switching new guts into an old receiver.
Stuart (the fuse) even sent me a bolt and I sent it back to him. I think I finally got a new bolt from Daisy. anyway big difference in the bolts and how they fit. ;D ::)
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Mark, remember I had all kinds of trouble last fall (got a M/M off of Ebay) after switching new guts into an old receiver.
Stuart (the fuse) even sent me a bolt and I sent it back to him. I think I finally got a new bolt from Daisy. anyway big difference in the bolts and how they fit. ;D ::)
Yes sir- big difference, and I do remember when you were having a problem with the bolt. At the time I thought you may have had a current production valve body matched up with an early bolt with the too small bolt probe that was causing blow-by because the barrel wasn't sealing. You may have also been fighting the same problem I mentioned above if your bolt is the large diameter type (current production) and you're using a metal receiver because none of the metal receivers are right for the current style bolt probe. It will work, but the bolt will be slightly cocked and cycling the bolt will not be as smooth as it could be- especially right at the end when closing the bolt.
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I once put new 880 guts in a Ted Williams and an 881. I had to clear a bunch of metal in several areas to get those done.
Needless to say, they are both pellet only now.
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I also remember at least one of those builds, Bill. You were using the earlier type metal receiver that has the LH stock screw and trigger guard cast as part of the receiver half. Had the gold finish, IIRC. They are different internally than the RH stock screw metal receivers as I'm sure you know, and I believe they take more clearancing than mine did. Either way, makes for a good shooter.
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Yes Sir. The TW is gold and the 881 is silver but that may have been polished to silver in a previous life. Best thing was, it took both guns from a smooth bore to rifled and eliminated the TP setup.
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For sure getting away from the TP seal is a plus, not to mention readily available, cheap seals and such. I look at them as the gun Daisy should have made all along.
Actually, there were a few years that have metal receivers and new style valve bodies- like the '92 20th anniversary gun. Problem with them is they came with a plastic lever that flexes even more than the new Chinese lever and they have those darned cast in instructions and warnings on both sides. One is an easy $4 fix but getting rid of the billboards means repainting. But they also have the nice wide loading port. So nothing's perfect- unless you make it so. lol
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Yeah, had to modify the loading ports on both to accept the winnie domes.
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I know this is an old thread, but I have made some observations of note.
First, the bolt probe is .22 or, as noted, 7/32" diameter.
(If you come up with a .22 barrel, just open up the chamber throat and you are there....)
That is why it doesn't slide in the receiver.
Second, the chamber is .22 also. It necks down to .177 for the barrel breech.
That is why the receiver needs to be ground at the loading port to fit, and the old style .177 bolt does not seal the chamber.
I may be able to machine a brass probe to fit both the receiver and the chamber, but not sure as yet.
Some grinding may still be required at the loading port end to clear the O-ring.
Also, there is no provision in the old style pump frame to secure the pump tube from sliding off the nose of the valve body.
New style frames have a dimple in the top for this purpose.
The pump tube may stay on the valve if it is stuck, but can come loose and pop off the valve while pumping.
Another solution is to drill a hole and install the center barrel support from a 901, but that must be placed properly and the nub ground
down carefully in order to allow the pump piston to get past and still retain the pump tube.
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Upon closer inspection of the metal receivers, the old 822 and 922 receivers would be suitable for drop-in
conversion with the new mechanism.
the 822 would work fine: the 922, as it is clip-fed, may only work if 977 clips are used, and I'm not sure if they would work.
The castings are actually different in the area of the loading port and the way it mates with the chamber if the valve body.
The notion of a hybrid bolt not requiring grinding of the receiver also met with its demise.....
so, it can be successfully accomplished, but grinding of the receiver halves is a total prerequisite if you want smooth operation.