Advantage of Metric LH thread pitch?

TacticalGuju · Jul 15, 2020

This concerns 45 ACP pistols. Glock 21 to be specific.
Is there any advantage to the metric LH thread pitch on some threaded barrels? I am debating on buying a metric LH threaded barrel & Osprey piston at my LGS vs waiting until they have a RH imperial. I heard somewhere that the LH thread pitch is more secure. Not sure what is correct. Any input is greatly appreciated. I am new to firearms.

Prince Yamato · Jul 16, 2020

My own experience is that metric left hand stays on tighter. It has the distal portion past the treads to which a rubber o-ring can attach.

All the Austrian and German guns use LH metric threads. I’ll trust their engineering.

mcb · Jul 16, 2020

There is nothing inherent to left hand or metric threads that will make is more secure vs right hand or US Customary threads. Now there may be some validity to left hand thread and a right hand rifled barrel creating a dynamic that keep the suppressor tight but the geometry of the threads are pretty much identical between metric and USC and left and right as simple mirrors of each other.

748 · Jul 17, 2020

There is none. Avoid french threads. This isn't europe, for most of us.
Go with the simplest system you can find in the US: Imperial thread pitches, Lefty loosely, righty tighty.

MachIVshooter · Jul 17, 2020

No advantage.

If you live in the US, stick to the US standards, which is .578-28 (37/64-28) for .45. You'll have far more mounting options than M14.5x1 LH.

748 · Jul 19, 2020

I had to buy a 10x1mm thread barrel and gemtech SFN for my fiveseven pistol.
It sucks, I can only use the 10x1 can on that gun.
I'm just glad I wasn't an early adopter when the Gemtech SFN was selling for $1,000+.
Got mine new at fire sale pricing for $400.

TacticalGuju · Jul 20, 2020

Thank you all for the input. I am going to order a .578X28 RH threaded barrel for the Glock 21. I hypothesize the reason for LH threads is to produce barrels that are proprietary, forcing one to purchase more adapters.

Sebastian the Ibis · Jul 24, 2020

LH threads suck hard, with RH adapters. Are you tightening one or loosening the other?

Prince Yamato · Jul 25, 2020

TacticalGuju said:
. I hypothesize the reason for LH threads is to produce barrels that are proprietary, forcing one to purchase more adapters.

They’re standard in Europe. Honestly, I prefer them but you do pay more because they’re less common here.

Advantage of Metric LH thread pitch?

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