Not to derail the topic but need a bit of help. I have the RAR in .223 and the fixed optics. I had feeding troubles with the magazine but a little time tinkering and I get all 5 in the chamber without a bobble. Problem mentioned above is with the COL. Currently using the 75 HPBT seated deeply in the case. I saw someone on here was modifying the mags for better seating with the long bullets and wanted to know if these were for sale yet or is there an aftermarket magazine available? Thanks.