by buckeye3405 » Fri Sep 14, 2018 11:37 am
They look like the factory 450BM mags that came with my 16" Bushy made upper. I have 1 factory mag with the black follower and 2 Bartz mags with the blue followers. I've had 0 malfunctions with any of my mags. One thing I do notice is that when the top round is pushed back against the metal lips of the magazines it will hit the bolt catch upon insertion. The top round must be pushed ahead just slightly if being loaded into a rifle with the bolt locked back. It seems as though on a standard 5.56 mag the rounds and not interfering with the portion of the follower that engages the bolt catch on the last round. Just one minor observation I've made. If they are loaded into a rifle with the bolt closed and loaded by pulling the charging handle to the rear and released there is no issue. When i first built my 450 I thought something was wrong. Just seems to be the nature of the 450 beast.