An extremely popular BB Air pistol with many of my YouTube viewers and Replica Airgun Store purchasers has been the Cybergun Sig Sauer X-Five P226. The interesting thing about this very realistic Blowback BB shooter is that it comes in two versions, the Standard version and the fully loaded Sight Rail version that includes a Sight Rail, Compensator and a fully adjustable Rear Sight. If all you got for the extra $10 was the fully adjustable rear sight it would be worth it alone, but you also get the Metal Compensator and Metal Sight Rail for mounting a targeting scope.
I recently added the Sight Rail version of this very fine Cybergun Sig Sauer P226 Replica and plan to at least do a condensed review on it to show off some of its extra bits and pieces.
And again, I have some photos for you so you can get a nice close look at this amazingly realistic BB Replica.