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)Clearance for new bolt probe
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.