For those with out of state shipping address.
https://www.primaryarms.com/Magpul_PMAG_30_AR_M4_Window_GEN_M2_MOE_Black_FRE_p/mag570-blk.htm
https://www.primaryarms.com/Magpul_PMAG_30_AR_M4_Window_GEN_M2_MOE_Black_FRE_p/mag570-blk.htm