Maybe they thought their boy won:

https://thegunblog.ca/2017/05/27/andrew-scheer-on-guns-recap-of-new-conservative-leaders-policy/

Andrew Scheer promised if elected to:

Remove the power of the RCMP to make reclassifications
Repeal restrictions on magazines like the 10/22
replace rules with a system based on advice and input from firearms associations.

Repeal the UN Firearms-Marking Regulations
Strengthen the Firearms Advisory Council to ensure that this group of firearms experts has meaningful input on government policy decisions. 

Decriminalize administrative infractions such as late renewal of a recently-expired firearms licence.

 create an Ombudsman to advocate on behalf of the firearms community. This person will have the authority to review any proposed regulation and interact with the Public Safety Minister on behalf of individual firearms owners and the various firearms organizations.