Speed Seal Plunger for BK1S/BK2S Siren did we mention it'll take

did we mention it'll take a K25

Because it's hard to keep the Flag & Armor BCAR in stock lately

K25 will push it to the 240s - we'll see where we can take it further

Matches nicely with the Python Stock

Speed Seal Plunger for BK1S/BK2S Siren did we mention it'll takeTheorized, Designed, and created in the BCFF Ecosystem an upgraded plunger for the Zius BK1S and BK2S. SLS printed in Nylon by a local canadian fab shop. This has been our starting point for improvement, pretty much the first step needed to push the performance on the Zius BK1S BK2S blaster. This is a speed seal plunger, the o ring will feel looser and floppy untill air pressure friction is pushing into it's sealing position. Which results in low drag