This wording on the Gunworks add is the clue Best for harris bipods with "spring loaded extending legs" as the spikes are easily fitted. Harris bipods with "spring powered retractable legs" are more difficult to fit, however we can fit instore for an additional $20 if needed. You can fit yourself but they can be very difficult.
Plus they are the exact ones I bought off them for my Harris.
For my Atlas I bought airsoft spikes which were cheap and at the time didn't attract any unwarranted attention from customs.
Only issue was I needed to skim them on my lathe to get them to fit.
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