Got a brick of CCI Blazer (500 rounds). I understand bulk Blazers comes in two flavors... 1. 500 rounds packed into ten 50-round cardboard boxes. Each box has a plastic thingee that separates each of the 50 rounds. Or... 2. 525 rounds all thrown in together will nilly into one big box. I also understand #1 is supposed to be of slightly higher quality as the lubricated lead bullets are not allowed to bump into each other possibly causing them to deform. Anyhow, I have #1. My question is I found approximately one (sometimes two or three) cartridges with a "F" headstamp in each cardboard 50-round box. The rest of the box, the cartridges have the usual CCI "C" headstamp. I also noted CCI does not show Blazers on their website list of 22LR ammo along with Stingers, MiniMags, Velocitors, etc. Are Blazers "contract" ammo made by whomever at the time, in this case I presume Federal? The reason I ask is I just got an Advantage Arms G19/23 conversion kit. A kit insert recommends Blazers and NO Federals. I broke in my new kit with 50 rounds of CCI MiniMag 40gr round nose with not one hitch. I then switched to Blazers. I had 11 FTEject and 6 FTFeed in 46 rounds before I stopped and returned to using MiniMags. (Which out of the remaining 99 rounds of MiniMags I had on hand...one FTEject. Total MiniMags: 149, only one FTEject.) Who manufactures the "F" stamp? (Pictured on this website: http://www.afte.org/ExamResources/g...2_GALLERYSID=04cd54539cce18c03a8297b09c46fcf7) And why is it mixed in with the other "C" stamped Blazer rounds? I used 4 different mags (Blazer problems happened with all of them). My kit has the latest "low cut" feed lips to reduce ejection problems, if that matters. It would be a bummer if I can't use Blazers as they are significantly cheaper than MiniMags. Thanks.