Angry Canadian gun owners hope to pressure the federal government into renewing support for a private member’s bill to abolish the long-gun registry by withholding donations to the Conservative party.

“I just returned the latest (Conservative Party of Canada) CPC donation envelope, without any $$$, and with the following written across the form in black Sharpie,” said a message to from someone using the moniker Plinker, who sent back a donation form with the message: “No donation until Bill C-301 is passed. Scrap gun registry.” Another, calling himself Soulchaser, said he sent an unsigned cheque for $1,000 and a note: “Support C-301 and this will be yours.”

While the effectiveness of the boycott remains to be seen, such a revolt by bedrock Conservative supporters is bound to cause some waves in the once populist party, observers say.