Bad fittings, no quality control and indifferent customer service - Grey Birch MFG La Chassis 10/22 Long Action Complete Chassis System

Purchased the Grey Birch 10/22 from Optics Planet and had to immediately exchange for another because the stock screws did not tighten the folding mechanism to the stock and chassis leaving me with a wobbly stock (Optics Planet's exchanged the product for another without problem although the process was a bit cumbersome). The foregrip also did not center on the bull barrel and (as noted by others) the on-line instructions were out of date and at least one set screw was missing. The second chassis/stock was better although the foregrip still does not center on the barrel for reasons I cannot ascertain. But more frustrating is that the Magpul MOE SL AR grip that I purchased does not fit onto the chassis grip fixture (not even a little bit). I suppose I will have to sand the grip until it fits? When I first contacted Grey Birch via email (no telephone number provided), I receied a fairly indifferent email response but no offer to discuss the issues by phone or suggestions for resolving the problems. Their web literature seems pretty folksy with jokey asides throughout; maybe they should spend more time fixing the machining tolerances and testing products before shipping to retailers. On the positive side: it is a good looking rifle (unfortunately I have not had a chance to fire it yet since I've been spending all my time trying to get a product I can assemble)!