There are certain aftermarket "drop in" mag followers for AR-15 magazines. In looking at some USGI magazines I acquired, there doesn't seem to be an easy way to get the old follower out and the new one in.

Surely there must be an easy way; tell me what it is.

Grumulkin, it's easy to get the old followers out and the new ones in.

Check out this Brownells video... AR-15 Mag Rebuilding/Spring& Follower Replacement

Thank-you.