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The a1 has slightly larger sights to improve the aim, a shorter hammer spur and a longer grip safety to reduce hammer bite, an arched mainspring housing to give a higher natural point of aim for snapshooting, and a shorter trigger with finger clearance cuts in the frame to gain a better trigger finger position. You should take a look at these for a budget 1911. Not much more money, but way better quality. I have both, and I prefer the SAM.