At the range last weekend my model 27 had 2 failure to fires and 1 failure to feed. The no fires were with reloaded ammo, reloaded by a friend with good powder, properly sized brass and federal primers. The jam was on the feed ramp and was with white box winchester FMJ's. I had the weapon looked at and was told I had a "tight extractor." I had the extractor replaced and the firing pin channel cleaned. Is it a good idea to install a stronger striker spring? It just makes me a little nervous that I had a couple of different problems on the same day with different kinds of ammo. The gun is about one year old. Any advice from you expert Glockers would be appreciated.