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I have learned so much from this thread. You all are such great teachers. Why stop now?

I am not familiar with the names.

It would really help if you could explain what follower and feed lips do? A diagram would help too. Thanks.

It would still have the durability issue because of the complexity and the ergonomic issue.

Actually.... It is important to determine the minimum operating and maximum operating limits of the tested rifle. However I suspect that having the height of each bullet and the total number of rounds alone, would not be enough to accurate calculate the correct upward force. Is it possible that...

I assumed the k remained the same. Ok. If a spring length is increased for a higher capacity magazine, then we must use a 'softer' spring to compensate the greater tension, hence lower (k). (The extra length of pre-compression * y lbsf/inch) >= minimum operating limit. (The total height of...

Correctly me if I am wrong, the greater pre-compression would implied 40 rounds mag (when fully loaded) would exerted greater upward force that 30 rounds mag.

But an operator would rely mainly with his arms to support his rifle, which could cause fatigue faster. His body would support the rest of his gear.

Would the weight of 60 rounds AR magazines interfere operator maneuverability and endurance? I deliberately picked 40 rounds magazine to work with because I suspect the weight would be the issue.

Judging user's feedback here, people don't seem to enjoy 40+ rounds magazine because it is not ergonomically compatible with standard 30+ rounds magazine. This is my new direction now.

Thanks. The damper would force rounds to shift position in a magazine during a stripping operation, which unfortunately would result of jamming. I think carefully calibrated spring is the correct approach. I was not entire wrong though. According to Jon Snow's calculation, the 40 rounds...

Thanks. This is a very useful piece of info. Thanks for your patience! Your calculation clearly showed the length of a spring required for x rounds magazine. It will come in handy in the future. However in order for a 40+ rounds magazine to be practical, I would need to rethink the 'shape' of a...

I didn't know 40+ rounds AR magazines already existed and I was told that the spring pressure would be too great for stripping rounds reliably over 40+ rounds. Since there is no such thing as constant pressure springs, so I decided to find another solution for stripping rounds reliably over 40+...

I agree. I have been thinking of ways to reliably feed 40+ rounds without the need of the damper.

I agree with other assessments. The initial design would not work. I have been thinking ways to improve it.

I have been thinking of ways to improve it

Are these type of 40+ rounds magazines for AR reliable in combat situations?

I didn't know 40+ rounds already exist. It would seems these types of magazines utilize specialized designed springs carefully calibrated for various rounds upward pressures. I am very curious to know wherever they are durable and reliable in combat situation. I am trying to come up a design...

This is a initial design and of course there is always room for improvement.

I can see that one could simply re-orient his rifle horizontally.