CMMG Magazine, MkW-15, 458 Socom, 10 Rounds, Polymer, Black, **Mfg Warning: Capable of holding 11 Rounds if Forced 48AFC44 After extensive testing of magazines for the 458 SOCOM" the Lancer L5 Advanced Warfighter Magazine was the top choice due to the polymer body and steel feed lips. The CMMG-modified Lancer L5-AWM takes this top of the line magazine and perfects it for the wide range of 458 SOCOM ammunition on the market by modifying the way the feed lips hold the ammo. The feed lips are not machined or weakened. (Laser Engraved 458 SOCOM)*Manufacturer Warning: This magazine is a modified 30rd 5.56 magazine and as such can still hold 30rds of 5.56 ammo. The magazine has been modified to function properly with 10rds of .458 SOCOM" but will physically hold 11rds if forced.*