good pics,,now i see the problem, no friction through the center so you have to hit from the side,,( joking ) ok,,so now that i see the gap between the outer and inner barrel i would suggest sourcing out revy or home hardware for a material that would be a good candidate to fit over the inner barrel snug, but leave a fraction of space for the slide action.like say automotive hose tubing and plumbers tubing comes in so many sizes you may have to shape and cut either one to make the proper form but it could work.
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