I have two NIB (opened to look at and try on my 5rd mag) Area 419 mag extensions. I only shoot 5rd mags.....A little more research would have saved me the cost/shipping. I am looking to trade for new/slightly used 5rd AI or Accurate . 308 mag(s) with or w/out binder plate. I can add $$ to the difference if Mag(s) are worth more than the extensions.