FYI: The original 1911 mag (welded bottom) used a steel L shaped follower. To go to a 8 round count in these mags, the steel follower front downward tab is shortened to allow the follower to go down father in the mag body to get the extra round in. The problem with shorting the L tab is this allows the follower to toe forward down since the front friction support has been reduced (read last round jam).
On the 47 mag, the old steel L type follower was replaced/mag designed with a Plastic skirted follower. This skirted follower does not have the same problem such as nosing downward (canting) as the shortened steel L follower used on the 8 old designs.
Simple put, the problem that you have been reading in regards to 8 round mags has been in regards to the welded bottom steel mags using a shortened L follower.
As for selling the 47's, if you want to sell them at a reduced used price, IM me and we can work out a deal.