Great magazine for 6br or 6dasher - MDT Metal AICS SA 12 Round Rifle Magazine

I purchased this magazine after making the mistake of listening to AI which told me that this was the best magazine for my 6mm GT build. The description is inaccurate on Optics Planet website for this item as it states that the maximum COAL is 2.870" with a binder. This magazine will not handle a round longer than 2.505" as stated on the package.