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.
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| The Steel Breech is an inexpensive upgrade. |
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| You just take the pistol apart, and put it back together... |
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| Add a shoulder stock (I bought two for the price of one through the online airgun classified pages) |
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| The only modification to get to this point is to drill the barrel band/pump tube plug (part #1300A006) out to 7/16" |
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| Pushing out the roll pin that retains the barrel band unit. |
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| Just an ugly plastic part. The general idea of my project, overall, is to replace any plastic with metal. |
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| I took some measurements and made some simple drawings. I decided a 3 part assembly would replace the one part unit. |
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| Facing a length of aluminum rod. |
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| Turning the diameter for the plug. |
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| Filed and scotchbrite-ed. |
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| I flipped it around and mounted it true in the 4 jaw chuck, then cut it off to length. |
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| Turning a smaller diameter for the actual barrel band. |
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| Drilling for a #10 screw thread. |
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| Tapping with hand power, using the lathe for alignment. |
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| Picking up the edge, so I can find the center line. |
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| Picking up the end. |
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| Spot drilling for the roll pin that retains it in the pump tube. |
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| Drilling for the roll pin. |
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| 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. |
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| 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. |
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| All done, except for deburring. You'll notice the groove around the plug. That's just an aesthetic groove... |
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| Installed in the tube. |
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| One part of three all done. |