why no 3 lug with supersonic?

[garredondojr]

i'm trying to understand why supersonic operation isn't recommended? is it strictly due to gas leakage past the inner sleeve or something else?

I'm wanting to do a 3 lug for 9mm and a cartridge in the same power levels as 5.7x28 and 22 tcm.

[alordnapa]

i'm trying to understand why supersonic operation isn't recommended? is it strictly due to gas leakage past the inner sleeve or something else?

I'm wanting to do a 3 lug for 9mm and a cartridge in the same power levels as 5.7x28 and 22 tcm.

Given that the response to your question was deafening ( No suppressor pun intended) I will ask the question: WHO says that three lugged mounting is bad for use with supersonic ammunition? I suppose the poorer alignment of a QD would make for a more dramatic baffle strike with faster projectiles, and it would be a lot harder to make a "perfect" gas seal with lugs than fine threads, but all things being otherwise equal, what difference would it make to anyone? I have seen Lugged suppressors on AR's without loss of noticeable performance or loss to life and limb. A lug is at heart, a wide pitch, interrupted thread screw mount. Am I missing your point entirely?

[Fulmen]

HK has used the tri-lug for decades, they don't have any such limits on their HW.

[garredondojr]

Given that the response to your question was deafening ( No suppressor pun intended) I will ask the question: WHO says that three lugged mounting is bad for use with supersonic ammunition? I suppose the poorer alignment of a QD would make for a more dramatic baffle strike with faster projectiles, and it would be a lot harder to make a "perfect" gas seal with lugs than fine threads, but all things being otherwise equal, what difference would it make to anyone? I have seen Lugged suppressors on AR's without loss of noticeable performance or loss to life and limb. A lug is at heart, a wide pitch, interrupted thread screw mount. Am I missing your point entirely?

I have no clue to be honest that's why i'm trying to wrap my head around it. I just have been reading some old threads about the subject and they stated it wasn't a good design for high pressure/supersonic rounds (ie. 300 blackout with supers, 5.56, ect...)

for ease of install and to get the suppressor as far back as possible i'd like to try it on my .223 short wildcat but I also don't want to damage the suppressor. from a concentric view I could see it being slightly less accurate than thread on as the sleeve to housing has to have some clearance to plunge in an out plus the same for the snout of the adapter to sleeve but the 30' shoulders of the lug/ sleeve should center that up decently.

[garredondojr]

I would machine my own 3 lug adapter and I was going to machine the sleeve with two guides like the griffin adapter to prevent it from getting cocked one way or the other and it should help slow the gasses from comming out.

has anyone one tried teflon seals on something like this? I know the direct injectors on modern cars are just a thin teflon seal that get's compressed into the grove of the injector shaft with a very simple tool (basically a tapered sleeve slightly larger than the injector's shaft with a tapered cone to stretch the seal enough to get over the shaft) these seals can handle combustion pressures and temperatures, granted they do fit tighter than I would like for a qd mount.

[garredondojr]

here's a interesting concept. it uses 2 of the teflon(ptfe) seals as "slides" then a special teflon seal(glide seal) in the center with a o-ring beneath it to push it into the sealing surface. they claim 5800 psi sealing capability and 500' F temps

[yondering]

here's a interesting concept. it uses 2 of the teflon(ptfe) seals as "slides" then a special teflon seal(glide seal) in the center with a o-ring beneath it to push it into the sealing surface. they claim 5800 psi sealing capability and 500' F temps

This is the same seal system used in the variable valve timing system (VANOS) on many BMW cars.

[poikilotrm]

MP5s have used supersonic ammo for a long time and they have three lug QD mounts.

[BigBlockBobby]

I shoot one of my Sig MPX's with a 3 lug and never had any problems shooting super sonic with it. I'm using a Rugged Obsidian .45 with the rugged 3 lug adaptor and a HK parts 3 lug. <img src='https://i.imgur.com/rsikx6x.jpg' />

[garredondojr]

9mm muzzle pressures are sub 10K and closer to 5k.

the cartridge and barrel length i'm playing with will be more in the 24-25K psi range at the muzzle with supers.

I would love to try it just heard some bad reports and hesitant. nobody has used a 3 lug on say a 300 blackout with supersonic loads or maybe 5.56 with a 12.5+ barrel?

[poikilotrm]

Those lugs are pretty substantial. I would think they could handle the pressure, seeing as how the firce isn't really directed onto the lugs. This is a vented open system, after all.

[garredondojr]

after some more reading looks like the gemtec arrow has a tri lug style setup for their suppressor. and its rated for .338 lapua??? hmmm

[gunny50]

H&K G28 FH are available with 3 lugs to, thats a 7.62 and no problems.

As long as Lug mm2 is enough there should be no problems, just look at the locking lugs in blow-guns.

It all comes down to precision machining and tolerances.

Gunny