Ive decided I want to sell my late 1800's J. Stevens Diamond model pistol, so I can fix my T38 Carbine (I finally understand you Mosin people, I have it just as bad for my Arisakas!

)
Im kinda lost on shipping for it though, It is a antique but its chambered in .22 LR (read that they are rarer than just the .22 short ones), Does it matter any that its in a "modern" chambering?
Also any tips for selling on a auction site like gunbroker? I know one of our members tried to sell a Mosin, but the buyer ended up not wanting it because of a forced matched buttplate, (Honestly, is there any such thing as a "all original" Mosin?

) I would just like to avoid a fiasco like this...
Thanks!