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Never found a spring to do it, but supposedly if can do a threaded barrel like the SD setup(as in a 2 piece outer, with a barrel threaded on to the chamber), put a spring that has ID that's big enough for a inner barrel, OD thats small enough to fit inside the outer barrel, you can try to fix that spring onto your inner barrel(tape supposedly works), while letting it put some spring pressure on the chamber such that it will more readily retract...
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