Posted by tdevince:
Data using the Berger 30 grain Varmint Match bullet. I anticipate this to be close to the Barnes 30gr Varmint Grenade when it becomes available:
Trim Length: 1.129"
Primer: CI-400
Case OAL: 1.580"
Powder: Ramshot TruBlue
Powder Wt: 5.8 Gr.
Avg. Velocity: 1924 fps
Energy: 247 ft-lb
Powder Wt: 6.0 Gr.
Avg. Velocity: 1967fps
Energy: 258ft-lb
Powder Wt: 6.4 Gr.
Avg. Velocity: 2091 fps
Energy: 291ft-lb
Powder Wt: 7.0 Gr.
Avg. Velocity: 2222 fps
Energy: 329 ft-lb
Edit: Corrected typo on velocity for 6.0 gr.
Friday, November 28, 2008
Thursday, November 27, 2008
PS90 Trigger Job
This service will be available starting in DECEMBER. We have to put together the support text and do some stress testing. We won't be taking orders until that time. After payment is received we will contact you and have you send us your stock and triggerpack (no bolt or receiver means no BATF paperwork is necessary). We will modify the trigger system in four ways:
The trigger is smoothed by honing and dry coating pertinent surfaces.
We will cut the length of the trigger pull in half and limit the back travel. This makes double and triple tapping the trigger much faster and easier. You'll also notice that your carefully aimed shots will come more naturally- you'll no longer need to take a breather halfway through the squeeze! This modification can not be reversed.
If you wish we will make the trigger weight adjustable. You will be able to remove the trigger pack and choose between original weight and 1/2 weight. The half weight setting is particularly attractive to the PS90 owner who is also a practicing marksman. We have a PS90 that consistently shoots 1 inch groups @ 100 yards. For safety reasons, the half weight setting should not be used in patrol situations, if you will be maneuvering with a loaded weapon, or in any instances where the adrenaline is pumping.
The last modification mechanically links the safety switch to the hammer. Without this modification, the weapon can accidentally discharge when dropped or struck- regardless of the safety setting. A factory PS90, WITH THE SAFETY ON, can be made to DROP its HAMMER and FIRE by violently slamming the butt of the weapon into a wall. When rifles with our trigger job are set to "Safe" the hammer can't drop. A precision trigger like ours is more sensitive to accidental impacts - the existence of a mechanically linked safety is an absolute must. When FN designed the P90 they compensated for the unlinked safety by giving the weapon an annoyingly long and heavy trigger pull. We have found a better way.
We will be permanently modifying and replacing parts of your weapon. This will VOID your warranty with FNH.
Precision triggers of all makes are more likely to cause an accidental discharge than their factory counterparts. Our trigger job is no exception to this rule. When the saftey is OFF this trigger job makes the weapon more likely to fire unexpectedly. Extra care must be used to avoid dropping or knocking the weapon. ALWAYS keep the weapon pointed in a safe direction. We will have you demonstrate that you understand these points by signing a simple form.
The trigger is smoothed by honing and dry coating pertinent surfaces.
We will cut the length of the trigger pull in half and limit the back travel. This makes double and triple tapping the trigger much faster and easier. You'll also notice that your carefully aimed shots will come more naturally- you'll no longer need to take a breather halfway through the squeeze! This modification can not be reversed.
If you wish we will make the trigger weight adjustable. You will be able to remove the trigger pack and choose between original weight and 1/2 weight. The half weight setting is particularly attractive to the PS90 owner who is also a practicing marksman. We have a PS90 that consistently shoots 1 inch groups @ 100 yards. For safety reasons, the half weight setting should not be used in patrol situations, if you will be maneuvering with a loaded weapon, or in any instances where the adrenaline is pumping.
The last modification mechanically links the safety switch to the hammer. Without this modification, the weapon can accidentally discharge when dropped or struck- regardless of the safety setting. A factory PS90, WITH THE SAFETY ON, can be made to DROP its HAMMER and FIRE by violently slamming the butt of the weapon into a wall. When rifles with our trigger job are set to "Safe" the hammer can't drop. A precision trigger like ours is more sensitive to accidental impacts - the existence of a mechanically linked safety is an absolute must. When FN designed the P90 they compensated for the unlinked safety by giving the weapon an annoyingly long and heavy trigger pull. We have found a better way.
We will be permanently modifying and replacing parts of your weapon. This will VOID your warranty with FNH.
Precision triggers of all makes are more likely to cause an accidental discharge than their factory counterparts. Our trigger job is no exception to this rule. When the saftey is OFF this trigger job makes the weapon more likely to fire unexpectedly. Extra care must be used to avoid dropping or knocking the weapon. ALWAYS keep the weapon pointed in a safe direction. We will have you demonstrate that you understand these points by signing a simple form.
Berger 30gr Varmint Data
Posted by tdevince
Data using the Berger 30 grain Varmint Match bullet. I anticipate this to be close to the Barnes 30gr Varmint Grenade when it becomes available:
Trim Length: 1.129"
Primer: CI-400
Case OAL: 1.580"
Powder: Ramshot TruBlue
Powder Wt: 5.8 Gr.
Avg. Velocity: 1924 fps
Energy: 247 ft-lb
Powder Wt: 6.0 Gr.
Avg. Velocity: 1697fps
Energy: 258ft-lb
Powder Wt: 6.4 Gr.
Avg. Velocity: 2091 fps
Energy: 291ft-lb
Powder Wt: 7.0 Gr.
Avg. Velocity: 2222 fps
Energy: 329 ft-lb
Follow-up by Medula Oblongata:
I've experimented with these up to 7.4 grains, but I would consider 7.0 to be the maximum that I would give to another person to shoot.
Data using the Berger 30 grain Varmint Match bullet. I anticipate this to be close to the Barnes 30gr Varmint Grenade when it becomes available:
Trim Length: 1.129"
Primer: CI-400
Case OAL: 1.580"
Powder: Ramshot TruBlue
Powder Wt: 5.8 Gr.
Avg. Velocity: 1924 fps
Energy: 247 ft-lb
Powder Wt: 6.0 Gr.
Avg. Velocity: 1697fps
Energy: 258ft-lb
Powder Wt: 6.4 Gr.
Avg. Velocity: 2091 fps
Energy: 291ft-lb
Powder Wt: 7.0 Gr.
Avg. Velocity: 2222 fps
Energy: 329 ft-lb
Follow-up by Medula Oblongata:
I've experimented with these up to 7.4 grains, but I would consider 7.0 to be the maximum that I would give to another person to shoot.
Wednesday, November 26, 2008
FiveseveN Magazine Disconnect Howto
OK, the official Leelaw Method™ FN Five-seveN Magazine Disconnect Disable.
Note: I do not warrant any of the work performed within this tutorial. However, I have had absoloutly NO failures of any kind since I performed this modification to the Magazine Disconnect on my FN 5-7 IOM, and have every expectation that it will work the same for your pistol as it has for mine. Again, I make no guarantees about this, for legal reasons.
On to the tutorial.
I purchased a FN Five-seveN IOM about two years ago, and was overall pleased with the gun except for one feature - the magazine disconnect. A magazine disconnect is, in my opinion, a safety issue, since it could be possible, however remotely, that I need to fire the gun when between reloads, without a magazine inserted, and with a round in the chamber. The magazine disconnect, by virtue of its design, would prevent me from doing exactly that. So I set out to disable mine in such a way that it could be done without damaging the mechanics of the pistol, and also be reversed if need be.
First, the magazine disconnect for the FN Five-seveN must be explained a little bit.
There is a tension bar (it will be pictured/explained in pictures below) which puts downward pressure on the linkage between the trigger and sear. When this tension bar does as stated, it disconnects the trigger linkage from the sear and prevents the striker from falling.
When a magazine is inserted into the magazine well, a "shelf" (for a lack of a better term) on the right side of the magazine pushes UP on the tention bar, allowing the trigger linkage to raise upwards, too. When the trigger linkage is in this upward position it reconnects with the sear and will allow the striker to fall when the trigger is pulled.
Once I recognized the way the magazine disconnect worked, I set out to fix it, and did so, in the most simplistic terms, by manipulating the position of the tension bar so that it always puts upward pressure on the trigger linkage, and always allows the hammer to drop when the trigger is pulled.
On to the method:
1. Engage the safety of the Five-seveN
2. Completely empty the firearm - empty the chamber, and remove the magazine. DO NOT ATTEMPT TO DO THIS OR ANY GUNSMITHING ON A LOADED FIREARM! I can not be held responsible if you injure yourself from attempting this modification.
3. Remove the slide from the frame.
The inside of your firearm should look like this.
Explanation of the parts:
Lower Tension Bar Retainer
Tension Bar
Upper Tension Bar Retainer
Trigger Linkage
Note how the Tension Bar is held in place by the Upper and Lower Retainer. These pieces are plastic and are not in any other way attached to the Tension Bar, other than simple friction. Also note that the Tension Bar is pushing downward on a little "finger" at the bottom of the Trigger Linkage.
4. Insert a small jewelers flat-bladed screwdriver, between the Tension Bar and the frame of the pistol, and gently pry the Tension Bar toward the opposide side of the frame.
5. When the tension bar has cleared the Upper Retainer, use pliers or your finger to pull it upwards, towards where the slide would be.
6. Let the Tension Bar rest on TOP of the Upper Retainer, putting upwards pressure on the Trigger Linkage.
Your pistol should now look like this.
7. Reinstall the slide.
8. Check to make sure that the firearm is completely unloaded.
9. Check for proper function of the firearm. While pointing the firearm in a safe direction: Disengage the safety and pull the trigger, releasing the striker; cycle the slide; pull the trigger, releasing the striker, and hold down the trigger; cycle the slide; release the trigger, noting that the trigger reset functions properly; pull the tirgger, releasing the striker; cycle the slide; engage the safety and pull the trigger - if your striker falls at this point, something was done wrong and you should have your pistol checked by a professional gunsmith immediately!
I hope this has been informative. The modification should be 100% reversible (I verified this today) and your firearm will not be damaged by it. I've put almost 1,000 rounds through my Five-seveN since performing this modification and it has run 100.00%
Disabling the magazine disconnect this way requires NO modification to the magazines.
Please PM me with any questions you may have.
Note: I do not warrant any of the work performed within this tutorial. However, I have had absoloutly NO failures of any kind since I performed this modification to the Magazine Disconnect on my FN 5-7 IOM, and have every expectation that it will work the same for your pistol as it has for mine. Again, I make no guarantees about this, for legal reasons.
On to the tutorial.
I purchased a FN Five-seveN IOM about two years ago, and was overall pleased with the gun except for one feature - the magazine disconnect. A magazine disconnect is, in my opinion, a safety issue, since it could be possible, however remotely, that I need to fire the gun when between reloads, without a magazine inserted, and with a round in the chamber. The magazine disconnect, by virtue of its design, would prevent me from doing exactly that. So I set out to disable mine in such a way that it could be done without damaging the mechanics of the pistol, and also be reversed if need be.
First, the magazine disconnect for the FN Five-seveN must be explained a little bit.
There is a tension bar (it will be pictured/explained in pictures below) which puts downward pressure on the linkage between the trigger and sear. When this tension bar does as stated, it disconnects the trigger linkage from the sear and prevents the striker from falling.
When a magazine is inserted into the magazine well, a "shelf" (for a lack of a better term) on the right side of the magazine pushes UP on the tention bar, allowing the trigger linkage to raise upwards, too. When the trigger linkage is in this upward position it reconnects with the sear and will allow the striker to fall when the trigger is pulled.
Once I recognized the way the magazine disconnect worked, I set out to fix it, and did so, in the most simplistic terms, by manipulating the position of the tension bar so that it always puts upward pressure on the trigger linkage, and always allows the hammer to drop when the trigger is pulled.
On to the method:
1. Engage the safety of the Five-seveN
2. Completely empty the firearm - empty the chamber, and remove the magazine. DO NOT ATTEMPT TO DO THIS OR ANY GUNSMITHING ON A LOADED FIREARM! I can not be held responsible if you injure yourself from attempting this modification.
3. Remove the slide from the frame.
The inside of your firearm should look like this.
Explanation of the parts:
Lower Tension Bar Retainer
Tension Bar
Upper Tension Bar Retainer
Trigger Linkage
Note how the Tension Bar is held in place by the Upper and Lower Retainer. These pieces are plastic and are not in any other way attached to the Tension Bar, other than simple friction. Also note that the Tension Bar is pushing downward on a little "finger" at the bottom of the Trigger Linkage.
4. Insert a small jewelers flat-bladed screwdriver, between the Tension Bar and the frame of the pistol, and gently pry the Tension Bar toward the opposide side of the frame.
5. When the tension bar has cleared the Upper Retainer, use pliers or your finger to pull it upwards, towards where the slide would be.
6. Let the Tension Bar rest on TOP of the Upper Retainer, putting upwards pressure on the Trigger Linkage.
Your pistol should now look like this.
7. Reinstall the slide.
8. Check to make sure that the firearm is completely unloaded.
9. Check for proper function of the firearm. While pointing the firearm in a safe direction: Disengage the safety and pull the trigger, releasing the striker; cycle the slide; pull the trigger, releasing the striker, and hold down the trigger; cycle the slide; release the trigger, noting that the trigger reset functions properly; pull the tirgger, releasing the striker; cycle the slide; engage the safety and pull the trigger - if your striker falls at this point, something was done wrong and you should have your pistol checked by a professional gunsmith immediately!
I hope this has been informative. The modification should be 100% reversible (I verified this today) and your firearm will not be damaged by it. I've put almost 1,000 rounds through my Five-seveN since performing this modification and it has run 100.00%
Disabling the magazine disconnect this way requires NO modification to the magazines.
Please PM me with any questions you may have.
70-80 grain loads
I still have some data on my 69 grain loads from the old site, but I finally have some new data for my 77 grain loads. I have been testing out some heavy subsonic loads for use with a suppressor in both the handgun and the rifle. Ever since I bought some Lapua 69 grain Scenar BTHP for a .223, however I had always wondered, every time I saw them on my reloading bench, about loading them in a 5.7x28 cartarige. One day I couldn't ressist. I found a good load for the 69.6 grain Lapua with 3.4 grn of Power pistol, a BR CCI Small Rifle primer. It grouped well and was very quiet out of the suppressor on the handgun.
Lapua 69.6 grain Scenar BTHP w/ Power Pistol and WSR primers (Handgun)
(Average)
3.0 grn- 1049 fps
3.5 grn- 1200 fps
4.0 grn- 1335 fps (barely noticible crater)
Nosler 77 grain Partition w/ Power Pistol and WSR primers (Handgun)
3.0 grn- 956.1 fps
896.7 fps
957.9 fps
error
error
3.2 grn- 1059 fps
1041 fps
1037 fps
1062 fps
3.4 grn- 1126 fps
1113 fps
1105 fps
1095 fps
1100 fps
Lapua 69.6 grain Scenar BTHP w/ Power Pistol and WSR primers (Handgun)
(Average)
3.0 grn- 1049 fps
3.5 grn- 1200 fps
4.0 grn- 1335 fps (barely noticible crater)
Nosler 77 grain Partition w/ Power Pistol and WSR primers (Handgun)
3.0 grn- 956.1 fps
896.7 fps
957.9 fps
error
error
3.2 grn- 1059 fps
1041 fps
1037 fps
1062 fps
3.4 grn- 1126 fps
1113 fps
1105 fps
1095 fps
1100 fps
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