Summary

This is the bolt and bolt handle for the Daisy 880, Daisy 901, and Winchester 1977.

I made a metal bolt a while back and it worked very well but I used an AR15 bolt catch spring for the bolt arm and since it was not captured without the arm installed it made installation a pain. I wanted to redesign it with a captured plunger so I modeled it up and 3D printed one before making it out of metal to verify it fit correctly and worked as expected. It turned out pretty good. So I put one of Ron's probes on it and put it in the 822. It seals great and works perfect. The only tricky part to make is the plunger but it would not be difficult to make with a file and a power drill. Just chuck up a 3MM brass rod and spin it on the file to create the 6mm long by 2mm diameter tip then cut it off a few millimeters back from the 2mm end you just ground then you can grind the base down to 1mm thick. The rest is just tap the end for #6-32 to attach the probe and tap the side M4 to insert a 4mm set screw to capture the spring. I used 3mm dowel for the swivel pin. The hole in the body is just undersized so I hold the dowel with pliers then heat with a lighter or torch and push it into the bolt body until it is flush with the back side. Now that I know the design is good I'll make some drawings and cut some out of aluminum. For the probe contact Ronno6 at https://www.gatewaytoairguns.org/GTA/index.php?board=186.0

The non-printed parts list is below, but I'm sure you will be able to find parts in lower quantities.

Springs
https://www.amazon.com/dp/B07RH6C16Z?psc=1&ref=ppx_yo2ov_dt_b_product_details

3mmX8mm Dowel Pin
https://www.amazon.com/uxcell-Stainless-Support-Fasten-Elements/dp/B07M9TT4P2?th=1

3mm Brass Rod
https://www.amazon.com/Brass-Round-Stock-Diameter-Length/dp/B09YC9P2YF/ref=sr_1_1_sspa?keywords=3mm+brass+rod&qid=1682711866&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzTUtBNjZZSVNNNE4zJmVuY3J5cHRlZElkPUEwOTUxNzg5OFZYUzFEVEdDSkk5JmVuY3J5cHRlZEFkSWQ9QTA1NzU2MzQxSEcwMkNFOVJHMFdRJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

M4 X 4mm Set Screw
https://www.amazon.com/Eilumduo-50PCS-Socket-Screws-Stainless/dp/B09CT91ZF9/ref=sr_1_3?crid=1AG010SI7SC6E&keywords=m4+x+4mm+set+screw&qid=1682711957&sprefix=M4+X+4mm+%2Caps%2C287&sr=8-3