Try being a little firmer and try other mags.
You should be able to seat most modern magazines loaded to 30 rounds on a closed bolt.
I began shooting AR's back in the day when everyone downloaded to 28 and I just continued the practice. I also pretty exclusively use USGI aluminum mags.
Most important is that the mag reliably feeds that first round.
Patriotism means to stand by the country. It does not mean to stand by the President... - Theodore Roosevelt, Lincoln and Free Speech, Metropolitan Magazine, Volume 47, Number 6, May 1918.
Every Communist must grasp the truth. Political power grows out of the barrel of a gun. Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party Mao Zedong, 6 November, 1938 - speech to the Communist Patry of China's sixth Central Committee
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