Yeah...I figured the rear receiver pin was what you were talking about. Never used that term but I guess it's accurate. I'd go ahead and get the bolt buffer style myself...those won't walk out on you or disappear when you remove the action from the stock. As for scopes on the 10/22, I have a BSA on one of mine, and a Simmons on the other. Both are very good IMO for the 22lr and sihouette shooting. You may also give a look at the CenterPoint Optics scopes now on the market. Made right here in the good 'ol USA and gaining excellent reviews. I hear the optics coatings are very good as well. Remember.....it is a 22lr, and you should avoid over-scoping the rifle for the round...no need with a 22lr.