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the 2837218 has the Q5 MATCH M1 (Lever Magazine Release) the 2813335 has the mag release button behind the trigger guard see the models here waltherarms.com/handguns/q5-match/ I suggest the 2813335 because it has a more conventional mag release and under stress you will revert to what you know

Spartak, the only difference is the Walther PPQ Q5 model 2837218 has the Magazine Release on the Trigger Guard and the PPQ Q5 model 2813335 has the standard Magazine Release Button behind the Trigger Guard. Personal preference as to which you like better.