This has everything I would do:
http://www.topgunsupply.com/sig_p228-9mm_parts-kit.html
The parts kit includes the HD (inner and outer) roll pins. These are critical and MUST be replaced every 5,000 rounds. Top Gun Supply has been my go-to for SIG parts for years with excellent service. If...
I once asked Charlie that question on the phone a few years ago. He comment was if I wanted to, then use one of the GSSF kits with standard springs. The G-17 I carry most of the time is set up like that. Every serious Glock I own has a factory "-" connector, including those carried on and...