RB Concepts .21 S7


Old 03-10-2019, 05:56 AM
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Questions?? RB Concepts .21 S7

Hi guys, I've purchased a used RB .21 S7 nitro engine on ebay, Is there any piston/sleeve kit which would be compatible? No luck finding the original RB parts in stock anywhere, since its an old engine by now.

Any help would be appreciated
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