Is the trigger group on the 870 Remington Fieldmaster different than the Wingmaster….seems I have read/heard there are plastic parts in the Fieldmaster? I know the Fieldmaster is a step above the Express model…. the wood is now walnut and fit & finish is very good on one I have seen. The price on one I saw was like $479 or there about. Any input on the Fieldmaster as to this trigger group difference. Thanks.