Do you know the twist rate? Do you reload? Do you end up with a few cracked case necks? What powder do you use? What bullet do you use? What cases do you reload? I have a AR 204 that I built with a 20" Lilja barrel, Geissele SSA-e trigger and a adjustable Odin gas block,,,plus a heavy buffer. I originally bought 40gr Fiocchi for it after I first built it. I used about 10rnds out of a 100 because they shot like shit. Reason being was because of the twist rate of my barrel was 12. Which Lilja stopped making and switched to an 11. Switched to 32gr Hornady super performance ammo and they shot unbelievably accurate. Most accurate gun I have. I now have enough cases that I can start reloading them. I chose to use IMR 8208 XBR powder with a Nosler 32gr boat tail bullet. While prepping cases I threw out maybe 5 or 10 out of 200 because of cracked necks. So either it was cheaply made brass or just that the bullet is high power,,,I don't know but I'm gonna say cheaply/thin made brass. Loaded up 15 rounds this weekend,,,,5 at 29gr,,,5 at 28.5gr and 5 at 28gr. To get an idea which one would give me the best accuracy. Shot the 29gr first,,,,they all clover leafed @ a 100yds,,,I was like damn,,,better check the shells to see if primers looked good,,,,which they did so I didn't bother shooting the other 10 rounds. So anyways,,,,I just love this gun and was wondering if anyone else uses one. I built mine to be able to use it on coyote in counties that dont allow rifles for deer season. The 204 is legal in these areas during deer season per the DEC. Says so on their website and I personally called and spoke to them. I also love the gun for chuck hunting because its so accurate and flat shooting.