Championship leader Max Cook stayed on top during qualifying to take pole as showers threatened to disrupt the session at Knockhill.
Cook saw off a challenge from former BTC champ Franco Bourne to grab the top spot by just 0.143secs, with Louis Valleley third. Seth Crump will head the second row, alongside Callum Bey who starts fifth.
Pirelli National Junior Superstock Championship with MotoNovo Finance, Knockhill, Qualifying:
1. Max Cook (Uggly & Co by Binch Pro) 50.905sec
2. Franco Bourne (Marvel HCL Motorsport) +0.143sec
3. Louis Valleley (Team Val-Tech Racing/Mortimer Racing) +0.150sec
4. Seth Crump (Seeeeeth) +0.312sec
5. Callum Bey (Filter Logic Yamaha) +0.573sec