Instlaled the new bolt buffer, auto bolt release, and extended mag release on my ruger 10/22. This is what I got from Ebay http://cgi.ebay.com/RUGER-10-22-BLU...ryZ73952QQssPageNameZWDVWQQrdZ1QQcmdZViewItem FWIW, try to get a bolt buffer without the steal core. Maybe it's just my luck, but the fit is tight anywaz so the core will seperate from the poly when you insert it. Mine looks all jagged in it after installation because I had to shim the metal core in to keep up with the poly. Mag release is a god send. Flick it forward and the magazine will literally fall out. Bolt release is cool. Not all what it's cracked up to be. It only really eliminates the last action of flicking the bolt catch and release. But it's annoying enough that it's welcome. And if you look at the difference between that and the original, it's a 30 second dremel job. I think I'll grind mine down and sell it on ebay for $10-$12 like the rest. Then I got the extractor upgrade. http://cgi.ebay.com/RUGER-10-22-MAT...goryZ383QQssPageNameZWDVWQQrdZ1QQcmdZViewItem The extractor hook was identical in size and shape as the original. The spring however was longer. I just swapped springs. I was expecting a sharper edge or something. Nah. Something jsut blued. And in case you do order any of these, be aware of the complete lack of instructions. Now I'm pretty new to firearms, so maybe there's a bit of a learning cure. Took me about 30 min to install all of it, simply because I had to figure it out as I go.