The flat spring has a very narrow inside diameter..and the SP01 polymer guide rod is needed to flex.
The two steel FLGR that I have for my SP01s only work with the Wolffe recoil spring as there is room to move around and get the rod to fit.
oh yeah...no problems with my polymer ones either..I just like goofing around with different things..
Jim..thanks for your experimenting..Its great to see different people work up things for these great guns..
ever thought magwell?

can't use one in USPSA production..but sure would want to play with one...
