I have a G 17 with a Burris Fast fire red dot on it. I have about 2000 + round thru it, about 300 with the sight. The last few range times I had several failure to feeds and a few stovepipes. I was using Federal and Herter's ammo(Russian steel case). Up until then, I had maybe 3 failure to feed/ stovepipes. Any ideas? Thanks in advance!!