Potatoes last one shot, so build reusable! Discuss ammo designs and ideas. Tough to find cannon part or questions? Ask here!
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Airsoft pellets average about 5.95-6.03mm and store bought 1/4" ball bearings are 6.35mm, so theres a bit of a size difference. Assuming the brake line is nearly airtight with the bearings it would have to be a pretty loose fit for airsoft, far looser than a store bought 6mm barrel.
I'm currently on the hunt for a good barrel for the 1/4" slingshot ball bearings. I'm looking for air tight interference fit. Closest I've found so far is a copper pipe at 6.5mm inner diameter, sadly its as thin as a staw which results in effortless bending.
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Assuming your bearings are really 1/4", you can make your own using a 1/4" reamer and maybe a 6mm. Start with some 6mm ID thick wall tubing, if it's the welded crap with a seam on the inside, run a 6mm reamer through it to remove all the crud. Then run the 1/4 reamer through it. Having access to a lathe might help, and if it's a long barrel you will need an extension for the reamer(s).
I had considered doing similar to a brass airsoft barrel as they're easy to get a hold of. My idea was to simply cold ream the barrel by hammering a 1/4" bearing through it. Crude, but without a workshop it might suffice. If it does work it would give me nearly the tightest tolerances possible.mrfoo wrote: ↑Wed Feb 12, 2020 2:03 am