Compatible Models: R510, R515, R520, R530, R540, R540-XD, R720, R720-XD, R730, R730-XD, R740, R740-XD, R740-XD². Model: B4 Ready Rail Inners. Rails: Rail Inners. We are aware that mistakes and problems can always occur but we will endeavour to get any issue resolved as quickly and fairly as possible.
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