This JP Enterprises Gen 2 Silent Captured Spring System is optimized for 9mm PCC rifles. For .458 SOCOM. I would recommend the JP Enterprises Gen 2 Silent Captured Buffer Spring System (H2) found by using the link below:
https://www.opticsplanet.com/jp-enterprises-gen-2-silent-captured-buffer-spring-system.html?_iv_gun-model=ar-15&_iv_additional-features=heavy-h2-buffer-version