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I’m interested in pics and a range report.
Two questions:
Did they open up the gas port?
How much do they charge for that?
Barrel Threading For AR and other standard Barrels $65.00
This covers cutting/crowning as well as threading. These threads will be the perfect size threads and will be perfectly concentric to the bore. The barrel must be removed from the receiver for this service; if sending a complete upper you must select the correct disassembly/reassembly fee. Gas port work if necessary is included in this price.
We can not thread barrels that do not come out of the receivers - i.e. Beretta Storm.
Thoughts on barrel threads.
Unless a specific cut to length is noted in the comment section, the barrel will be threaded and not cut at all.
Steve At ADCO is the man ! He and his crew did great work for me assembling and pinning a FH on a 14.5 Colt barrel.
You can’t even see the pin unless you really look hard and there turn around time is the best
.Love to see some pictures of your Build 
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Nice writeup. I’m not surprised the PPU ammo gave you problems. I had a bunch of PPU brass in a batch of mixed headstamp stuff that I picked up awhile back, and even after full-length resizing that stuff would cause all but one of my rifles to lock up solid.
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Why didn’t you open up the gas port?
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That front FSB taper pin doesn’t look right. It’s flattened on the end or something. And yes… the port probably should have been openned a little. But ADCO surely knew to do this.
You have it backward - putting a can on it means a SMALLER gas port.
I would be pissed off if my rifle didn’t run any better than that. I’ve never seen a cut barrel that ran until the port was opened up to totally inappropriate diameter.
First, unless you specifically told ADCO not to open the gas port, they probably did it anyway.
Secondly, as was said, you have it backwards. You do not open up the gas port if you plan on running a can.
The failures you are experiencing are totally unacceptable.
Forgive me if I missed this in all the verbage… but are you running an H3 Buffer? If not, you should be.
From my calculations you spent roughly $200 on ammunition and had a 10% malfunction rate. That’s an expensive lesson.
I would get some PMC Bronze ammo, load one round into each mag, and with a weak grip and shoulder, make sure that everyone one of them locks back. They may all be the same make of magazine, but may have springs from different batches. You want to minimize the variables.
An H3 buffer with a .062" gas port firing weak ammunition? 
I was really hoping he had had success with it. It would have almost been safer to buy a new BCM barrel or an entire 10.5" turn-key upper.
OP: Try the same round of testing with the can mounted. But also maybe think about sending it back.
Well I don’t think he’s sure of the port still being .062. Weak ammo should run better than that… but shit ammo (PRVI, Wolf, etc., )shouldn’t be expected to run in any gun.
My point is that a gun that short should NEED a heavy buffer to control the bolt speed.
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Seriously- just get an LMT 10.5 and be done with it. The amount of money you’re going to spend in ammo and shipping getting this thing straightened out will pay for it.