Question is: has thing changed in 2010/2011 production?
I have a (2011) 22/45 upper coming, my MkIII lower (SS) is a 2010 production.... not sure if I need to go buy a dremel (finally)
![Shocked :shock:](./images/smilies/icon_eek.gif)
BTW, the underside of the receiver is a very narrow and shallow area, is hand filing realistic .. or do-able?