Easiest way is to get the whole block from brownells:
http://www.brownells.com/aspx/NS/store/Pro...p;s=49833#49833.
1. unload the gun
2. Take the slide off
3. Drive out the one roll pin pull the whole block (pulling the trigger will allow you to remove it) put the new block in drive pin back in and you're back in business.
http://www.brownells.com/aspx/NS/store/Pro...p;s=49833#49833.
1. unload the gun
2. Take the slide off
3. Drive out the one roll pin pull the whole block (pulling the trigger will allow you to remove it) put the new block in drive pin back in and you're back in business.