Quoted: A standard A2 aperature should screw in without any problem. I have done this for several of my A1 uppers.
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Given the alignment is close enough. The A-2 is wider, not as much windage to zero when mounted in a A-1 upper. If your A-1 shot with the sight centered [best case], The A-2 will work [nicely].
Toss the defect and get a sight with threads. Also, look at the quality of the apperature before mounting. Some are poorly made and will offer poor optical performance.