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Nuno, the difference is the A1's extended magazine tube, ghost ring sights and the heavier barrel with heat shield. Cheers and stay safe!

Nuno, the A1 model has a 20" heavy-walled barrel with heat shield and durable Parkerized finish, ghost ring sights, 8+1 capacity, and OAL of 41". The model you linked to has 18.5" barrel (not heavy walled), blued barrel finish, front bead sight, 5+1 capacity, and OAL of 39.5". Have a great day!