Finely got time to take my AAC built upper 300 out today, I will not fire more than one or two rounds before a FTF, or a FTE. I'm using a both Remington 220 gr OTM subsonic, and CMMG 175 grain subsonic both ammo have the same issues, my setup is a AAC 16" and I'm running a 762SD suppressor. I'm not sure whats the exact cause, but it doesnt want to feed out of the mag, has a hard time picking up a new round, out of the mag when its being charged. Then sometimes it requires a recock it to get it to fire then if it does eject it will either work as it should or the case will get stuck sideways, causing a jam. If it does manage to eject, it will fail to pick up the next round. First time I have ever had these issues with any caliber AR, I did notice it was very stiff and requires some "force" to get it to lock up, empty even. Does it need more break in, different bolt, buffer spring? Not sure where to start on this one, but if it needs a break in, it will take a while, at this rate.
Thanks


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