I own both.
The trigger and operation are the same on each. I prefer the grip on the A1 as it is a bit less slick. It seems to fit my hand better.
One difference between the two has been ejection, My A1 ejects all cases out at about 3:30. The M Ejects out at about 4:30. My M had a tendancy to send one case per magazine right back between the eyes, this stopped at about 500 rounds. The A1 never did this.
The rail on the A1 is one of the standardized designs as opposed to the m40 which has a proprietary rail and requires an adaptor to mount anything on it.
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