You know whats funny about the Larue/Lothar Walther stuff.. Back around 2012ish I called Lothar Walther and talked to the guy about getting a barrel made for an AR10 . The shop manager I cant remember his name but he was a gruff SOB told me he had made a large order of barrels and bolts for a company that screwed him on fullfillment and priced me two of them bolts and all for like $275 lol he also sold me a 223 barrel and bolt for about the same. Dude was really pissed off when I talked with him (of course my friend who dealt with them alot said the guy was always like that so I never really thought much about it). I still have those barrels lol and the one 308 I have on a shitty dpms upper will shoot lights f'ing out.
I used to do accuracy and final shooter QC as an independent contractor for a particular rifle manufacturer most here would recognize. I preferred to be independent because that would allow me to call out any problems I found without worrying about employment, and them still being held to the contractual arrangement.
At that time, the company used a lot of LW barrels, as well as Krieger barrels.
Many of the LW pipes would either need to be tested over and over until we could get a good
3 round group, or they would be rejected because we couldn't get a test target to ship with the rifle that met the standard.
Almost all of the Krieger barrels would crush it out of the gate, easy initial grouping, box it up and send it off. Some I would have to re-test.
I was going back and forth overseas at the time working with coalition sniping community partners in Europe, and the topic of LW barrels came up.
One guy owned his own firearms retail business there, and said basically what he heard at IWA (the European SHOT show) from LW was that they keep all their pipes that pass their German standard QC processes for the European market, and send the reject barrel blanks to the US "because stupid Yankees don't deserve the best they have to offer, can't shoot anyway".
The accuracy problems were not as bad with .308 bores though, so a lot of those shot just fine. In the 6mm bores and .338 LM, we had a lot that just wouldn't shoot. There was one particular customer that ordered a .243 Winchester initial barrel that would put 4 rounds into a bug hole, then always throw the 5th at 1.7" at 100yds. It was vexing, and repeatable no matter the shooter.
I don't recall if I ever got a .338 LM to shoot into the standard out of the gate with LW pipes. Maybe half of them would shoot 3rd groups after some breaking-in.
BTW, all the test ammo we were using was Lapua coming in on pallets in ammo cans. It was crazy burning through .338 LM just to do 100yd accuracy testing, sending nearby shooters packing after I politely warned them that they probably didn't want to shoot next to me at the range with that big muzzle break and .338LM or some of the .300 WM barreled-rifles.
The LW pipes I've used that were sourced within Europe were very accurate, including the 6.5mm and .338 LM ones. A good friend of mine had a custom LW pipe made for his rifle to shoot the GS Customs really long bullet, and we were punching chunks out of side plates from APCs at considerable distance.
Same with .260 Rem and 6.5x47 Lapua rifles. Anyway, this is what I think of when I see LW pipes and accuracy mentioned.