Maglula M-16/AR-15 magazine loader and unloader.  Protects the magazines and your fingers.  Fits most 10/20/30 and 100 round M-16 type magazines both metal and polymer style magazines.  Doesn't work well on the H&K steel magazines it may unlock prematurely from those.

M-16 / AR-15  LULA™ loader and unloader for all such metal and plastic  5.56mm / .223 magazines, including Pmags and Lancer.

They may also work with some 6.8mm magazines, but not all.

LULA™

Magazine loader & unloader

(US Patent 6,810,616, Canadian pat. no. 2,416,448)

The LULA™ loader & unloader is a military-quality personal magazine loader and unloader. It facilitates both loading of loose rounds into a magazine and unloading them out of the magazine. It does so fast, safely, comfortably and painlessly. Usable for tens-of-thousands rounds.