Yes it happened, 8/20. Returned from Liberty 9/2, no charge new mono-core.
Not sure how, plated 147 gr bullets, VV N320, 3.7 gr, EFK Fire Dragon Barrel, FNS 9.
It is possible the recoil booster was part of the cause, but not sure, but two rounds went down the
pipe and the pictures tell the results.
The inside surface of the booster was scraped on one side, but that may have been from the strikes causing unusual forces.
Maybe plated bullets, the jackets look to be torn off from the strike.
The large fragments bounced off of the paper target and landed at my feet, about 8 yards.
There is almost no torque shoulder on the EFK firedragon barrel for the FNS barrel. You need to have liberty make you piston that shoulders at the muzzle. I had the same issue with a mystic and the EFK barrel for my FNX
Once a Marine Always a Marine, so why reenlist?
Member of LSU
In Memory of the First Person to Get Me Into Guns, and NFA. RIP Edward R. Kline USAF Retired, August 12, 1953- May 26, 2012
Once a Marine Always a Marine, so why reenlist?
Member of LSU
In Memory of the First Person to Get Me Into Guns, and NFA. RIP Edward R. Kline USAF Retired, August 12, 1953- May 26, 2012
There is a shoulder difference between the EFK and Lone Wolf (LW) barrels, the outside diameter of the EFK is 0.500 inch and the LW is 0.569 inch. Threads on both are the same. Thus the piston of the Infiniti and the Osprey both thread until the barrel tip touches the non-thread inside of the piston or the end of the threads on the EFK. On the LW, the pistons (Infiniti & Osprey) stop on contact with the shoulder. So, this is a possible cause? I need some help understanding that, thanks.
See pictures of how paper slides under the piston with the EFK and is pinched between piston and barrel with the LW.
It's definitely clear why the EFK barrel produced a baffle strike; it's not shouldering properly, at neither the barrel shoulder or the barrel muzzle.
The LW barrel has a wide solid shoulder for the piston to sit on. No baffle strikes here.
The EFK barrel diameter is cut too thin. Even if there's a non-threaded stop inside the piston, it's not designed to seat the muzzle and be perfectly concentric to the bore. That's what metric threads are designed to do. Standard threads like 1/2x28 are designed to seat against a shoulder, which is not the case here either. It seems the EFK bore wasn't aligned properly with the can.
paper9 wrote:There is a shoulder difference between the EFK and Lone Wolf (LW) barrels, the outside diameter of the EFK is 0.500 inch and the LW is 0.569 inch. Threads on both are the same. Thus the piston of the Infiniti and the Osprey both thread until the barrel tip touches the non-thread inside of the piston or the end of the threads on the EFK. On the LW, the pistons (Infiniti & Osprey) stop on contact with the shoulder. So, this is a possible cause? I need some help understanding that, thanks.
See pictures of how paper slides under the piston with the EFK and is pinched between piston and barrel with the LW.
As I stated previously you need a piston that shoulders at the muzzle to accommodate the EFK barrel. Liberty will make you one, as for Silencerco I'm sure they might have one. I definetly would not fire either suppressor on the EFK barrel until you get new pistons.
Once a Marine Always a Marine, so why reenlist?
Member of LSU
In Memory of the First Person to Get Me Into Guns, and NFA. RIP Edward R. Kline USAF Retired, August 12, 1953- May 26, 2012
BigBoyToyz wrote:Noooooo, I am so sad. I also use EFK 9mm barrel with Infinity/Mystic for 92 Beretta but no strike yet.
Should I buy a lone wolf barrel to be safe?
The FNX/FNS barrels are too thin and when they are machined to 1/2X28 they have very little torque shoulder. You 92 should have plenty of meat on the barrel for a torque shoulder.
Once a Marine Always a Marine, so why reenlist?
Member of LSU
In Memory of the First Person to Get Me Into Guns, and NFA. RIP Edward R. Kline USAF Retired, August 12, 1953- May 26, 2012
Also, I sent the LW, EFK barrels and the piston/booster to Liberty.
As stated they were super on the core replacement, but no mention
of the shouldering or lack there of.
However, I will look into the EFK situation.
Also, the shouldering is easy to determine, see the pictures of how the paper
is pinched between barrel and piston.
paper9 wrote:I did not know that about the metric threads.
Also, I sent the LW, EFK barrels and the piston/booster to Liberty.
As stated they were super on the core replacement, but no mention
of the shouldering or lack there of.
However, I will look into the EFK situation.
Also, the shouldering is easy to determine, see the pictures of how the paper
is pinched between barrel and piston.
Definitely get a piston that shoulda at the muzzle and your golden.
Once a Marine Always a Marine, so why reenlist?
Member of LSU
In Memory of the First Person to Get Me Into Guns, and NFA. RIP Edward R. Kline USAF Retired, August 12, 1953- May 26, 2012
paper9 wrote:Would a EFK FNS-9 barrel with metric threads have the ability to properly shoulder?
thanks,
The thread pattern won't matter with these barrels. The FNX/FNS barrels should only be used with a piston that shoulders at the muzzle. There is almost no torque shoulder on them. Shouldering at the muzzle is a must with these barrels for the FNX/FNS. Once you get a piston that shoulders at the muzzle you can use it on barrels that have torque shoulder but not the other way around.
Once a Marine Always a Marine, so why reenlist?
Member of LSU
In Memory of the First Person to Get Me Into Guns, and NFA. RIP Edward R. Kline USAF Retired, August 12, 1953- May 26, 2012
Liberty custom made a piston for the FNS and EFK barrel combination it works, about 90 rounds and no strikes. Only took two weeks, Liberty really is great!
Last edited by paper9 on Fri Nov 07, 2014 9:44 pm, edited 1 time in total.
paper9 wrote:I did not know that about the metric threads.
Also, I sent the LW, EFK barrels and the piston/booster to Liberty.
As stated they were super on the core replacement, but no mention
of the shouldering or lack there of.
However, I will look into the EFK situation.
Also, the shouldering is easy to determine, see the pictures of how the paper
is pinched between barrel and piston.
Definitely get a piston that shoulda at the muzzle and your golden.
This terminology is not familiar to me. What part of the can is the shoulder? I know which end is the muzzle but can't figure out where this location is at on the barrel.
I just got my Mystic out of jail and don't want to mess it up from the start. My Glock 19 has a LW barrel but plan on using this can on my Stag Arms AR 15 as well. Got a barrel for my Browning 9 mm on the wish list.
As a side note, I have a EFK barrel on my Sig P229 .40 and used it with a YH Cobra with no issues to date but want to check it as it also has a 1/2x28 threaded barrel.
paper9 wrote:I did not know that about the metric threads.
Also, I sent the LW, EFK barrels and the piston/booster to Liberty.
As stated they were super on the core replacement, but no mention
of the shouldering or lack there of.
However, I will look into the EFK situation.
Also, the shouldering is easy to determine, see the pictures of how the paper
is pinched between barrel and piston.
Definitely get a piston that shoulda at the muzzle and your golden.
This terminology is not familiar to me. What part of the can is the shoulder? I know which end is the muzzle but can't figure out where this location is at on the barrel.
I just got my Mystic out of jail and don't want to mess it up from the start. My Glock 19 has a LW barrel but plan on using this can on my Stag Arms AR 15 as well. Got a barrel for my Browning 9 mm on the wish list.
As a side note, I have a EFK barrel on my Sig P229 .40 and used it with a YH Cobra with no issues to date but want to check it as it also has a 1/2x28 threaded barrel.
The can shoulders against the 90 degree lip on a threaded barrel, it will shoulder just below the threads on the barrel where the piston meets when tightened. I have not seen an EFK barrel for a P229, but this was in regardes to an FNX and FNS 9 pistol. The factory, and aftermarket barrels are very thin and do not have much meat on them. When they are threaded they have very little shoulder for the piston to snug up against. When you use a barrel for an FNS/FNX 9, the piston has to shoulder at the muzzle to ensure proper alignment.
Once a Marine Always a Marine, so why reenlist?
Member of LSU
In Memory of the First Person to Get Me Into Guns, and NFA. RIP Edward R. Kline USAF Retired, August 12, 1953- May 26, 2012
paper9 wrote:I did not know that about the metric threads.
Also, I sent the LW, EFK barrels and the piston/booster to Liberty.
As stated they were super on the core replacement, but no mention
of the shouldering or lack there of.
However, I will look into the EFK situation.
Also, the shouldering is easy to determine, see the pictures of how the paper
is pinched between barrel and piston.
Definitely get a piston that shoulda at the muzzle and your golden.
This terminology is not familiar to me. What part of the can is the shoulder? I know which end is the muzzle but can't figure out where this location is at on the barrel.
I just got my Mystic out of jail and don't want to mess it up from the start. My Glock 19 has a LW barrel but plan on using this can on my Stag Arms AR 15 as well. Got a barrel for my Browning 9 mm on the wish list.
As a side note, I have a EFK barrel on my Sig P229 .40 and used it with a YH Cobra with no issues to date but want to check it as it also has a 1/2x28 threaded barrel.
I think I've got the shoulder/barrel terminology thing figured out.
This has been a very helpful and informative thread.
Couple things I've figured out to check to prevent baffle strikes in addition to the discussed shoulder topic: When I mount a can on a new barrel, I sight down the bore from the chamber end through the can to see if I see any shadows. I'll shoot without the can against paper at 3' & 9' to make sure the bullet isn't key holing. Also remove all washers/spacers like those on a flash hider.
I have enough cans and adapters now it is important that I don't try to shoot a .40 through a 9 mm adapter, i.e. get adapters mixed up.
This is a picture of my Sig P229 with EFK barrel and Cobra can. The post-it note shows more lip or shoulder than it actually is, probably twice as much. Not much shoulder here, but enough if I'm careful.
