Here’s my experience since the beginning of August…
In my worthless opinion, the BG2 OEM guide rod and spring assembly was a poor design.
The photo shows the twisted end of the spring only contacts the cap about 0.008” on the front of the guide rod.
The end of the spring would easily pop out from under the cap, as in the photo. That condition will prevent the guide rod spring assembly from seating into the collar inside the front of the slide.
When I first did a field strip, clean and lube out the box, it took me about 30 minutes of fiddling to figure out why I could not get the guide rod spring assembly back into the slide. After several times disassembling and reassembling, the end of the spring would pop out from under the guide rod cap and prevent reassembly.
I contacted S&W Customer Service, and my issue with the guide rod and also the issue of the 12-round mag hanging up loading at 3 rounds. I told the female customer service person that I fixed the follower. She was not interested in any of my feedback and there was no empathy or apology for the issues I explained. She simply offered to send a new guide rod. 16 days later I received the replacement. It was exactly the same part.
I decided, since I have a new spare, I would do my own “fixing” and “gunsmithing”.
Pulling the spring from around the guide rod was easy. With my Dremel tool cut-off wheel I cut about 3/8” off the twisted spring. I also cut-off about 3/8" inch from the end of the spring that contacts the rear cap on the guide rod. That was to see if it would reduce the amount of force and grip to rack the slide. Cutting off the twisted part of the spring, allowed the end of the spring to sit under the cap with about 0.026” of contact. With pliers I had to squeeze the spring end up against the guide rod after working the spring back onto the guide rod… that was NOT easy.
The photo shows my modified spring.
The other photo shows my Sig P365 Micro guide rod spring assembly. It has a flat washer under the rod cap that is 0.0835” wider than the end cap and perfectly covers the spring under it.
It appears that a thin little flat washer and a flat spring end would have been a better design for S&W…. BUT… what the heck do I know about firearm designs and engineering??