Unobtanium

Im torn on how I feel about that. If they took T series caps, and it was optimal, why invent another part number to manufacture and stock? They didnt do this for the t2 from t1...I find it sus.

What part number is/where did you order a metal battery cap?

That is truly odd with that ammo.

Brakes increase backpressure on a system and will often enhance cycling velocity. In broad strokes/as a rule.

Did you torque it to the correct 26.4 (+- of course...) inch pounds? I am eagerly awaiting your assessment of mount-to-optic shooting loose (or not)! THANKS!

Ultimately, one must look at fact: OP Purchased a Benelli M4. A Benelli M4 is described on Benelli's website as having a "Phosphate finished barrel" or a "Cerakote finished barrel", depending on the model purchased. OP's Benelli does not, indeed, have this, at present, even though OP was not consulted or informed of this fact, even though OP purchased a model which OP understood to have a phosphate finished barrel. OP did not receive what OP paid for.

Very nice! My concern is...what keeps the crossbolt/clamp from coming loose? I shot loose every crossbolt item I ever put on a shotgun, shot loose my scalarworks T2 mount at 15 in lb until I blue loctited it, and shot loose my IWC until I torqued to 30 in lb and blue loctited it. So the p2...has me nervous.

This is an M1014 barrel and has a FIXED MOD choke. https://www.gunpartscorp.com/products/1439820 This is a commercial barrel with interchangeable chokes. https://www.gunpartscorp.com/products/982970 If you are truly unhappy, you could simply come out of pocket and buy one of these, or you could ask Benelli to do it for you, or some voucher/reimbursement or some such maybe. That said, FUNCTIONALLY, your barrel is just fine, but aesthetically and so forth, I'd be frustrated like you seem to be.

The ding you showed me would not simply "stop", if it were a result of bolt meets ejector housing during proper function. I think it was a red herring, and properly cleaning/lubing/knocking down some high spots in the ano/phos are what met with success. Regardless, she is working right, now!

Review your ejector housing. I bet it does not show an ounce more damage. I remain thinking this was not the cause.

It only works for homogeneous items. Not complex items like vehicles, which have many multiple sub assemblies with varying lifespans.

Normal.

My 110# ex gf could run my Benelli m4. I truly doubt your size or technique is causing this, but I would recommend something better for lube, although what you are using should be sufficient...its in the USMC manual for this weapon, after all. I honestly am befuddled a bit. One other thing I note is the left impact area from the piston on your carrier rail face is near absent, while the right is very evident. Seems odd to me.

I lean this way, too, as there is no drag on the ejector housing side, and oftem Benelli parts do just show nicks. This doesnt look like one caused the other, necessarily.

This may be locking lug interface, too. I am not convinced for sure on this one either way.

I am unsure if that is the issue in your case. It looks like a 1 time ding maybe from something else in your case. Its hard to be sure without parts in hand.

Please see this thread for reference:

I am noticing on your ejector assembly, photo right side, what appears to be an impact and "shaving" zone. Please verify that the ejector assy and corresponding bolt surfaces have/have not been playing well together.

Normal, just takes practice.

This is odd, it looks like it's not getting enough gas to function, but that ammo should have zero issue with that. Does the weapon cycle by hand just fine? Have you verified that both gas pistons are present and accounted for? 1) Verify the weapon cycles without binding by hand. 2) Disassemble it and verify that the gas pistons and gas caps and O rings on the gas caps are all in good shape and present and were not in a defunct state. 3) Verify that all wear appears even and normal with no gouging or deformation occurring anywhere other than where one would expect, such as a bit on the side of the cam pin, the ejection port corners, etc. 4) Lubricate the cam pin and the rails of the carrier, and just everything in general, really. 5) Try a different ammunition. Other questions: Was recoil robust? Were ejected shells thrown 5+ feet away? It is always possible that you got some underloaded ammunition due to a factory error.

Does your m4 deviate from box stock in ANY way?

What product have you tried? Le133 or Le132 or both? If so, any difference between?

Ill follow on...anyone have function issues with LE133 00 at any juncture in an m4?

Then why be picky about the weight of the M3 vs. M4? I thought you were selecting, not battlefield pick-up ing?

AK operating system does not like the minimal taper 5.56 case. It is meant for heavily tapered x39 cases, and this is a huge aspect of its reliability and operating system design parameters.