Grendel vie six8 recivers

[m796rider]

Here is what I did to the mag bodies.

Left is modded, right is factory. Those 4 rear ribs need to be shaved nearly flush and the forward ribs until the rounds are not nosing inward. At this point, the modded 20rd mag with 19 rounds seats smoothly in the magwell with no binding.


Here are the lines left by the bolt carrier wearing a bit of the feed lips away, since normal bolt carriers are not relieved to fit the wider Six8 PMAGs. This does not take long.