Knock-out vectors are available for the generation of mutants through intron-retargeting typified by the ClosTron plasmid pMTL007C-E2 [1] –  available from the  

SBRC online shop.

[1] Kuehne SA, Minton NP. ClosTron-mediated engineering of Clostridium. Bioengineered. 2012; 3(4):247-54.

https://doi.org/10.4161/bioe.21004