If you're buying it to shoot, the extra $$$ for an A2 or a property-marked A1 is wasted money. The property markings obviously do not affect shootability, and the A2 reenforcements were added to strengthen the receiver for use in butt-stroking the enemy, or when undertaking high-impact missions like jumping out of airplanes. I don't beat up folks with my A1, or jump out of vehicles with it, so that's a moot improvement.

From an investment standpoint, there is a premium attached to A2 forgings and property markings because such guns are much more rare than A1s. They consistently run 15-20% higher than A1s in market value, and as A1s appreciate over time, the value of that percentage will grow as well.

Personally, I do not like to pay more than I need to for features that add no functional value. They eat up funds that would be better spent on accessories and ammo, and unneccessarily increase the "worry" factor every time you take your expensive toy to the range. But that's just my take.