I had a partial case head separation using a 1.8oz buffer

[stonehog]

The fallacy of this argument was already pointed out, but I don’t recall a refute to it.

Sample sizes, assumption of the forum being a comprehensive collection of all failures, and another poster’s search showing up multiple other brass types to his query.

Did you perhaps overlook those like I did the 1.8 ounce buffer?

1.8oz buffer is significantly less weight than your typical 2.9oz carbine buffers.

I would never put that light weight of a buffer in a CLGS .223 Rem, let alone 6.5 Grendel.

OP basically duplicated somewhat one of the main problems they experienced with the Edgewater spring guide in Vietnam, shooting the new M193 with ball propellant, only his chamber is really clean and more likely in-spec.

I apologize for overlooking this critical piece of information that now pretty much nails the coffin shut on early locking with CLGS and 1.8oz buffer.

More pics of the throats and the buffer/flat spring. I think you are absolutely right LRRPF52. This is not a carbine buffer/spring/tube - it is a pistol/pdw. I did tune the gas down for this system - it's an adjustable block, but not enough evidently. Is it even possible to tune it down enough to use a 1.8 oz buffer or is it time to get a regular carbine buffer/tube setup now? Don't answer that - I'm an AR newbie but learning fast...

My take on the throats are that the PSA and Odin are similar with large chamfers, and the Faxon has a smaller radiused throat. In any case, I shot 50 rds in the Faxon with Starline brass today doing ladder testing for 123gr ELD-M and 130gr TGKs with Shooters World Match Rifle and was getting higher vels than the A2520 load with no signs of pressure at all in the brass. FWIW...

These probably don't matter anymore, but for posterity...

Odin throat:
[ATTACH=CONFIG]19153[/ATTACH]

Faxon throat:
[ATTACH=CONFIG]19154[/ATTACH]

PSA throat:
[ATTACH=CONFIG]19155[/ATTACH]

Buffer and flat spring in Odin pistol:
[ATTACH=CONFIG]19156[/ATTACH]