Way too tight in any of my ar platforms. - Duramag SS AR-15 5.56mm/.223/.300BLK 5 Round Rifle Magazine

Way too tight in any of my AR platforms (Springfield Saints and PSA lowers). Four other brands of mags both polymer and metal all work flawlessly. When the Duramag is loaded to advertised capacity, they are so tight that the charging handle can't be pulled back to charge the weapon. When trying to release the loaded mag, I have to push hard on the bottom of the mag to reduce tension on the fit just to be able to press the mag release button. The only firearm that the Duramag worked properly in is a Ruger American Ranch 556 bolt action rifle.