I love the style and color of the sofa but the assembly was lengthy and frustrating.  The back did not fit into the hardware provided on the arms and I thought maybe I did not have the bolts tightened enough.  I bought a ratchet wrench and tightened all the bolts but the back still would not fit.  I replaced the bolts in the hardware on the arms to give some leeway in order for the back to fit.  That worked but the back is not fully stationary.  The back is definitely not long enough for a proper fit.  Seems to me your "quality control" is sleeping on the job.