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Discussed with my gunsmith and he enlarged the gasport. Tested at the range today and it ran flawlessly with the ASC 6mm ARC mag. He did mention it might become over-gassed over time, but since I have an adjustable gas block I can adjust as needed Seems like a design flaw by Odin.

I tried to go back and read others who have similar builds and my problem is a little different (or maybe it's not). I have an Odin 18" rifle + 2" 6mm ARC barrel with a Superlative Arms adjustable gas block. Initial setup with with an H buffer. Loaded a Duramag 6.5 grendel mag with 1 round each...

I think it's meant to be that way...it has texture.

I actually picked up my first shotgun (Beretta 1301 LE) after watching those videos. I used to think shotguns were crude weapons for old people & those who couldn't shoot straight and since I was proficient with pistols/carbines/precision rifles I didn't need to bother with shotguns, but...

Just because someone doesn't like loud noises, they're liberals? Maybe they moved out to middle of nowhere for some peace and quiet and they're genuinely bothered by the noise. And OP sounds like a reasonable guy, trying to find a solution where he can keep shooting while lessening the noise...

So.... I eventually heard from Federal. Took several weeks and a few emails, but they said they tested the ammo and everything was within spec. They said I should get the firearm checked for headspacing. Contacted CMT, the maker of the upper several times, but calls went to VM, which was...

No updates yet. They said maybe next week.

I didn't have calipers with me and didn't think of measuring, but to the naked eye, they didn't seem to be stretched out. Or maybe they were all stretched out and only 80.5 gr separated. Haven't heard from Federal about test results and have yet to hear from CMT. Will call CMT and see what...

Update Federal called back and said they'd run compression/expansion tests later this week. However, looking at the new pic I provided, they see stretching/rings in a few cases of each batch I shot. I also contacted CMT to see if I can get the upper inspected.

Thanks for the input. You brought up several points I didn't consider and I remembered some some initial issues that I addressed a while back. I had no cycling problems with FGM 90 gr, but later on, when I tried the Hornady 88 gr, I had some FTE and/or it was ejecting closer to 5 o clock...

I didn't see his post until I posted today. I don't reload so I didn't save brass. Next time I go out, I'll bring them home and bust out the caliper.

So I sent in a box of 80.5 gr back to Federal. They initiated UPS pick up. We'll see what they say... However, I went out today with all my 224 Valkyie ammo: FGM 90 gr (red box), FGM 90 gr (gold box), AE 75 gr, and FGM 80.5 gr. And as I expected, only FGM 80.5 gr had case head separation...

Wish I saw this earlier. See below.

I didn't hear back from Federal so I called this time and they called me back less than an hour. According to the person I spoke with, he's saying it's a headspace issue and the case is expanding too far before it contracts again before being ejected. I asked if the brass composition had...

Guess no one else.

Hello First post here. Mostly post on Calguns. I googled FGM 224 Valkyrie Berger 80.5 gr and found this post. I shot my first box yesterday and this happened to 2 of 20. I probably have around 200-300 rounds of FGM 90 gr (1st & 2nd gen), Hornady 88 gr, and Federal Eagle 75 gr without any...