Since I was bitten by the airgun bug, again, I've looked at all the wonderful
modifications people have
done to the simple Crosman 1377 pistol with awe.
I figured a good first project would be the conversion of the 1377 to a small carbine.
I ordered a steel breech and 24" barrel from Crosman (you have to call them to order parts), and bought the 1377 at our local BiMart.
|The Steel Breech is an inexpensive upgrade.
|You just take the pistol apart, and put it back together...
|Add a shoulder stock (I bought two for the price of one through the online airgun classified pages)
|The only modification to get to this point is to drill the barrel band/pump tube plug (part #1300A006) out to 7/16"
|Pushing out the roll pin that retains the barrel band unit.
|Just an ugly plastic part. The general idea of my project, overall, is to replace any plastic with metal.
|I took some measurements and made some simple drawings. I decided a 3 part assembly would replace the one part unit.
|Facing a length of aluminum rod.
|Turning the diameter for the plug.
|Filed and scotchbrite-ed.
|I flipped it around and mounted it true in the 4 jaw chuck, then cut it off to length.
|Turning a smaller diameter for the actual barrel band.
|Drilling for a #10 screw thread.
|Tapping with hand power, using the lathe for alignment.
|Picking up the edge, so I can find the center line.
|Picking up the end.
|Spot drilling for the roll pin that retains it in the pump tube.
|Drilling for the roll pin.
|I then inserted a drill in the hole and rotated the unit 90 degrees, using the drill to magnify the angular position. While not a perfect technique, it's very quick and gets you spot on, generally.
|At this point I had the vise snug but not tight and I pushed the plug all the way into the vise. I milled the slot for the lever arm.
|All done, except for deburring. You'll notice the groove around the plug. That's just an aesthetic groove...
|Installed in the tube.
|One part of three all done.
On to Part 2 of the article.
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