SAR 9 Captured Guide Rod

I've been looking for performance upgrades for my Sar9x for a while now, XX and the guys here are the only places I've been able to find meaningful upgrades, so far I've gotta say I'm impressed with the results of this guide rod and spring upgrade (whichever ones the heavier spring), gives it that nice crisp feel the stock spring was lacking, on top of no plastic being involved which is exactly why I needed this since the original one has this noticeably alarming crack in it. I'll be sure to spread the word indeed.