MBX Angled Basepad for STI/SVI & all 2011 PistolsMBX IPSC IDPA Angled Basepad for STI SVI & all 2011 Pistols "Box Rule" for IDPA IPSC fits 126mm and other applications where a lower profile Basepad is required or desired. Angled Base Pad is designed to work with the standard STI SVI & all 2011 Pistols Mag Well other Mag Wells require fitting adjusting to clear Basepad. Typically there is a loss of one round when using this Basepad. Tool Less Removal. Billet Aluminum * May need to be modified if used