Your posts suggest inconsistency of groups, if that is the case. What are you changing? Are range conditions changing? Scope problems and torque/contact points are change issues. Loads that are the same, normally perform the same. Barrels usually are consistent, until fouling or wear occur. I have seen some odd bench bag/rest setups cause major group problems.

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Plant 1,

I have mostly been working with IMR 4064, H4895, AR-Comp, W748, N135 and PP2000 MR

I have tried CCI BR2's, 34's and 200's for the most part. Those three primers show very little difference over my Lab Radar. There is a myth out there that the 34's are a mag primer. B.S.!!

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holy cr@p... it wont shoot 168 MK's over H4895?

somethings reeeeeeeeely wrong here.

be interesting to see your follow up after the range report.

Made it to the range yesterday. I trimmed all the cases a bit shorter than normal, pulled the suppressor adapter and did an experiment with shooting a group with an entirely different BCG.

No luck.

My dad gave me an old 16 inch barrel DPMS barrel a long time ago. I did not believe it was worth the trouble of even putting on a rifle. It has a carbine length gas system and took me 2 days to get what seems like 2lbs of copper out of.

I put it on the 2nd upper receiver i bought trying to solve the accuracy problem with this rifle. HA!!!

It ended up shooting decent. It does less damage to the brass than the rifle length 20 custom barrel does.

I actually shot MOA groups with it with 168's with both IMR 4895 and H4895.

At this point i am putting the high dollar crap away and just going to shoot this junker 16 inch DPMS barrel with the DPMS BCG.

When i can get a control group with it, if i can???

I will start adding and removing parts and components from the old rifle to see where the problem is.

The SAGA continues!!

Somewhat of a side note, with the DPMS re-build.

I did not grind on the barrel nut to ensure the gas tube was not touching. I also did not fret over the somewhat restrictive feel of the gas tube going into the gas key.

I also need to see decent results the next 2 range trips at least to believe this shoots ok.

Too many times have i had a good session, only to return for disappointment.

Over the years, I've had quite a pile of DPMS barrels, and only 1 or 2 could be considered duds, and several were amazing, including a couple I have now.

One of my regrets is not buying a few of their 204 barrels when Midway had them for $200 for years.

Sounds like you're on the right track. I'm reluctant to offer any more advice since everything has been a dead end so far, but it's worth noting that I have noticeably shrunk groups by tuning gas blocks down to barely function. It sounds like the custom barrel has a much too large port.