Not fitting - NcSTAR SKS Combo/Tri-Mount/4X30 Compact Scope w/1in Rings

l ordered one from an online dealer called Marstar Canada their online picture is the same as yours, on order l was put to some one in their fitting shop to tell me how to get it to fit because they are bigger and must be filed down to fit, when it arrived l put it on my sks it was smaller, l sent pictures showing how it sat on my receiver, l called back, already more then 1\32 forward of the back of the receiver if l filed it down to get the lock pin through, witch there is no way l could know how much l would have to take off and how much free space the bolt has before it hits the back of the cover, l was put to their gunsmith who told me if l thought it was defective to send it back but l would have to pay if it was not, l had got a 5 round mag all so that did not put the last round in but was sure that with the person l first talked to telling me it would bigger [extending behind the back of the receiver and this one was forward of the back of the receiver] l kept the scope and rings as it is the package as this, well the gunsmith emailed me the that the mag was defective but tri-mount was not it fit on their shop sks and if l wanted l would be sent a different tri-mount, l ask if it is not defective or the cover part to small well not all of them be the same size and well be to small and even smaller or more forward of the back of the receiver when filed so the lock pin well go though because l do not want to pay to ship an other part that well not fit [no one could tell how much free travel the bolt has before it would hit the back of the cover] l was told to send the scope and rings back at my cost and restocking fee [ my mistake should have sent it all back at the same time and looked for a place l could go to that sold these so l could take my cover and checked the size] there can not be that much difference from one sks to the next to make my cover that much bigger, so l would not recommend buying this online if you can find a store that sells these go take your cover check out the cover on the scope mount another part l noticed that online store sells is a bolt cushion witch no one said anything about l my not have ordered at all if they would have told me l would need this,just my thoughts about online ordering this part could cost more in the long run