BK1S prototype speedseal plunger head
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Plunger head replacement inspired by BCFF to improve the seal
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Speedseal plunger head I scrapped together while waiting for a better replacement and haven't worked out a secure mounting method for. Speedseals allow the plunger to move without a seal during priming (which is important for allowing the pusher/pt in the bk1s to return forward), and they seal when firing using air to push the seal in place.
I used a red swift o ring. Other o rings with a similar thickness and an od slightly over 30mm should work. It may still require a stronger return spring if the o ring isn't perfectly sized to slip out of the way during priming.
Check out the 604blasters speed seal plunger for a nicer fully tested plunger in nylon.
4/11/2025-fixed friction fix for mounting