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Irv, at Buds, I would recommend a 308 Calibrated Scope such as : https://www.budsgunshop.com/catalog/product_info.php/products_id/712016202/bus+ar+45-18x40+dz+308+riflescope ---- It is not in stock at Buds but, the Nikon 308 Scope https://www.amazon.com/Nikon-P-308-Matte-Scopes-4-16X42mm/dp/B01B6FBRQI
Irv - Allow me to introduce you to what I believe to be the best scope on the market, dollar for dollar, of the thousands and thousands of scopes being sold today. Vortex. For this M1A, a Vortex Crossfire II would be perfect. The 3-9X40 would be perfect for this rifle, at sorter to intermediate distances, and would still provide the capability to 'reach on out' and make your shots at 200, 300, even 500 yards, if you do your part. Lifetime "No questions Asked" warranty. Perfect scopes for teh shooter who wants to make the longer shots, but doesn't want to invest four figures in a scope.
100 yards on target any quality scope will do the job for you I am a fan of the Simmons "whitetail" series of scopes