I have a G-27 with about 1000 rounds through it. With about 200 rounds through it the stock spring assembly failed ( the spring slipped over the lip of the plastic rod and locked up the gun, It was difficult to field strip but I finally was able to get it ), I got a 18 lb all steel wolf assembly on a recommendation of Jack Tippett at a gunshow and I had some failures to eject with cheap Federal practice ammo but never my carry ammo (165 grain gold dots). I switched back to stock power 16 lb Wolf springs and it ran flawlessly for about 400 rounds until last weekend when I noticed the springs seemed to weaken noticeably and i had several failures to return to battery along with light primer strikes. I have the replacement stock Glock spring assembly which they replaced promptly when I sent them the original that failed last year, but I no longer trust the plastic guide rod. I guess I will just go back to the 18 lb Wolf assembly and continue to test it with Gold Dots to see if I have any failures. I guess my question is have you ever known of a spring to get weak in just a few hundred rounds through the weapon? Do you think using the 18 lb set up is reliable enough with Gold Dots?