525 has 14.75 LOP, XS Special has 14.312 LOP, 525 has standard style stock with sloping drop. XS Special has parallel comb and an adjustable comb. Both have 5 Midas extended chokes, XS has Cyl thru Mod. 525 has no LM or IM choke. 525 has a lot fancier metal work on the receiver. Xs has beavertail forearm, 525 has schnable. Hope this helps
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