Question about reverse thread muzzle device

[Hammercrg29]

Hello, I am looking to buy a combination barrel shroud/multi ported muzzle brake to fit under a free float forend I recently installed. The product has reverse threads so my question is, will is work on my standard 1/2-28 thread barrel? Any insight would be great.y appreciated.

[Alk8944]

If in-fact the shroud/brake has left-handed threads it will not work on a barrel with right-handed threads. From where did the information come that this accessory has left-handed threads?

[Hammercrg29]

From the dealer website for the product. Here's the link:

AR-15 CAL SLIP OVER BARREL SHROUD WITH MULTI PORT MUZZLE BRAKE - SkidTactical.com

[Tom S.]

I don't know why the dealer is calling it a reverse thread, but it's a left hand thread and will not work on a right hand thread.

Many suppressor/flash hider products are made with left hand threads on the belief that most rifles have right hand twist and therefore items with right hand thread are likely to come loose. Whether this is fact of supposition, I don't know. Eons ago, Chrysler made cars with the wheels on one side held on by left hand threads and the other side by right hand threads. Lots of those cars ended up with broken studs by hapless owners not realizing the difference. Chrysler came to their senses eventually making them all right hand threads.

[WR Moore]

I'm an old coot, Chrysler wasn't the only car builder to do that. Chrysler did hang onto the practice longer than the others did though.

[Hammercrg29]

Thank you for the response guys I appreciate it. I couldn't understand how that would work but thought I would ask to make sure.

[Rule3]

Just a "wacky" idea but perhaps contact him?

Contact - SkidTactical.com

[MikeR90S]

Irrelevant to the discussion, but the lug nut situation is called precession and the solution is different for center lock vs. regular lug nuts. Also applies to bicycle pedals.

I think for the barrel extending devices we are just dealing with torque and inertia (no nutation) and I haven't thought it through well enough yet. It does seem my left hand threaded barrel thread protectors (9mm) unscrew themselves, so it seems a heavier suppressor would do so too.

[WR Moore]

Agree. If I have it visualized correctly, right hand rifling twist torque reaction would tend to further tighten right hand barrel thread. Since there's no contact between bullet & muzzle devices, there should be no mechanical action on the device.

I will admit there might be some rotational component to the gas column exiting the barrel, but doubt it's significant. I have, however, been wrong before.

[Tom S.]

Originally Posted by WR Moore

Agree. If I have it visualized correctly, right hand rifling twist torque reaction would tend to further tighten right hand barrel thread. Since there's no contact between bullet & muzzle devices, there should be no mechanical action on the device.

I will admit there might be some rotational component to the gas column exiting the barrel, but doubt it's significant. I have, however, been wrong before.

There is rotational force applied to the gun from the contact of the bullet traveling down the rifled barrel. Thank you Mr. Newton and your 3rd law. Generally it isn't much and we often fail to notice it during the recoil. However when firing my Thompson Contender 14" 30-30 barrel, you WILL notice it!

[DWalt]

"Irrelevant to the discussion, but the lug nut situation is called precession and the solution is different for center lock vs. regular lug nuts. Also applies to bicycle pedals."

I had forgotten about RH and LH threads for bicycle pedals, but indeed they were threaded differently - may still be for all I know. I think there was an R stamped on the pedals for the right side and L for for the left side.

Back in the early 1960s, S&W changed from RH to LH threads for the extractor rod to prevent its unscrewing.

[Hammercrg29]

So I was thinking about this some more and I could very well be thinking the wrong way but what about this....since it's a shroud on slides over the barrel, picture holding the gun like your ready to fire it, the shroud slides over the barrel and then turns counter clockwise to tighten...reverse thread right? If you were looking down the gun barrel like it is aimed at you, the device would be turning clockwise but from behind the barrel your turning it counter clockwise. Does that make sense or am I sounding even dumber than when asked my initial question?

[MikeR90S]

No. Picture holding the barrel extension fixed and threading the barrel into it... clockwise for RH thread. I've gotten an appreciation for this from wrenching on cars, upside down and backward though you may be in accessing a bolt it, clockwise when facing it to tighten.