PIston based M4.. what M4 should have been

• Shotgun

  5 Jan 07, 00:35

  Sweet!!! Strip and show us how the piston works. Familiar with the existing AR-15, but not with the new piston thing.
  
  "TAKE IT OFF! TAKE IT OFF!"
• Meia Gisborn

  5 Jan 07, 01:28

  Originally posted by davechng:

  Meia!
  
  got a quick question for you, just bought me a CZ_75 P01! it is one of those compact ones with the light rail!
  
  ANy good smith or parts I can buy to upgrade the yucky trigger, and I seem to have problem finding custom parts like wood grips instead of the rubber one it comes with!
  
  Thanks!
  
  DaveC!

  DaveC,
  
  Congrats on your acquisition of the P-01!
  
  Unfortunately, as you've found out, the P-01's stock trigger can be gritty and unrefined. It'll usually smooth out after a few thousand rounds, but will never approach the silky-smooth pull and crisp break of the trigger on a well-broken-in CZ 75B, unless a trigger job is performed.
  
  You can lighten both the DA and SA trigger pulls by replacing the stock 20 lb. hammer mainspring with a lighter one from Wolff Gunsprings. A 17 lb. mainspring would be my recommendation, as a 16 lb. one (the lightest available) might not give the hammer enough energy to reliably ignite some of the harder primers found on 9mm milsurp ammo.
  
  Swapping in a lighter mainspring doesn't require the decocker mechanism to be disassembled. It will reduce the trigger effort, but not smooth out the trigger pull. For that, you'll need to perform a full-blown trigger job. The P-01's decocker mechanism is, unfortunately, a real b!tch to disassemble, and makes trigger jobs a real PITA. I've done repair work on a number of CZ's decocker models, but am currently not set up to do trigger jobs on them.
  
  To get a complete trigger job on your P-01, you have the following options.
  
  1. Send it back to CZ-USA and have their resident gunsmith, Mike Eagleshield, work on it. Do note that Mike is perpetually backlogged and you might have to wait 6 to 8 weeks for the work to be done.
  
  2. Send it to Angus Hobdell for the trigger job. Angus is a full-time CZ-sponsored competitive shooter who travels to matches all the time, so he's not always available to work on guns.
  
  3. Send it to Jim Miossi at Miossi Gun Works. Jim is also another CZ-certified gunsmith.
  
  If you're looking for custom wood grips for your P-01, take a look at the offerings by Omega Custom Grips. Sam's work is outstanding, and I have his grips installed on a number of my pistols.
  
  Hope that helps!
  
  MG
• davechng

  5 Jan 07, 05:52

  wow !Meia
  
  Thanks for the tip! I will defiently get a trigger job on the gun! I also got a Kadet .22 conversion! well! got this in a deal I cannot refuse ! the gun and the conversion for $400! comes New in the box for both and mags!
  
  Was wanting to get a race gun for the CZ! was thnking of the CZ champion! wonder how good those guns are in the 40 caliber over say a tune 1911 like a WIlson combat or Kimber!
  
  DaveC
• davechng

  5 Jan 07, 05:58

  HI Shotgun!
  
  Here is a link of how the gun strip apart ! the main difference is that now you have a piston opening in the front below the front sight, twist it and you get a gas plug and than a piston rod. the bolt carrier is modify now without the gas tube connector and the bolt does not have the gas seal ring.
  
  Look at the picture below and you will have a better picture. They also took out the front sight tower and mount a detachable front sight ! I am changing mine to a flip up and down version becasue it is blocking my electronic sight ! I will use the iron sight as a backup!
  
  http://www.pof-usa.com/P-416/P-416upper.htm
  
  DaveC
• davechng

  6 Jan 07, 00:04

  here is the picture of the piston .. and the design of the bolt carrier.
  
  
  
  
  
  DaveC
• moca

  6 Jan 07, 00:39

  Hi Dave!
  
  Can you please talk about the fluting on the barrel?
  
  I looked at the website briefly and I saw one upper which had what was called a "continuous fluting". The fluting on yours is different.
• davechng

  6 Jan 07, 01:28

  Hi Moca
  
  Basically the Continous fluting and mine is just a slight differnce... MIne has a M203 cutout notch just like what an M4 does! kind of asthetics to me since I am not putting a M203 on the gun. The continous flute just have a straight flute cut out on the barrel.
  
  The FLutes help to disipate heat out of the barrel thus accelerate cooling ... it really helps in getting mroe consistant shot when the barrel is hot hot.. and you can do more shots before have to let the barrel cool down...
  
  DaveC!
• glock

  8 Jan 07, 13:20

  Cant you tell I 'm just envious. I only have a Glock which spits out one 9mm round a second and I only have a 16 round mag.
  
• acwire_2125

  8 Jan 07, 15:16

  Any one here tried www.military-morons.com? They do good reviews of gun parts and offer other solutions for them...
• moca

  12 Jan 07, 12:40

  Hi Dave
  
  What is the barrel length of your weapon? Is it 14.5-inch?
  
  And you mentioned that it was accurate out to 100 yards - that's about 100 meters, right?
  
  What is its accuracy at 200 meters and beyond?
  
  What is the overall weight of your weapon without attachment?
  
  There is also on the POF site a 16-inch barrel upper. How much edge in accuracy and lethality does the 16-inch have over the 14.5-inch? is the extra 1.5-inch worth the effort?
  
  I have always thought that the military-issue M-4 should be a 16-incher.
• Beyond Religion

  12 Jan 07, 22:40

  
  
  Sorry for the noob question Dave, but do you live in the US? Or are we able to import firearms into Singapore?
• Meia Gisborn

  12 Jan 07, 22:51

  Originally posted by moca:

  There is also on the POF site a 16-inch barrel upper. How much edge in accuracy and lethality does the 16-inch have over the 14.5-inch? is the extra 1.5-inch worth the effort?
  
  I have always thought that the military-issue M-4 should be a 16-incher.

  The extra 1.5" is going to buy you a very slight increase in muzzle velocity, with a negligible effect on accuracy.
• davechng

  13 Jan 07, 13:43

  No this weapon is only availbale in the US. I don;t think you can ever have it imported to Singapore.
  
  
  
  Meia!
  
  I did not chrono the 16" piston rifle becasue I do not have one ! next time I will do a comparison between the 14.5 " and 16" carbine I have. I will let you know the results. I ahve not shot on paper for 200 meter and beyond! but we do oxygen cylinder setup at 200 to 400 yds and I can ding those gongs to 400 yds with my eOTECH with ease! for my previous 5.56 data! a 20" AUG will give 3100 fps with the M855 ammo! and my 16" M4 will do 2750 fps. on a 90 degree Hot Texas Summer.
  
  I have mine registered as a C3 weapon here so the 14.5 is okay! but if you do not want to go thru the hassle! than they have a 14.5" gun with the vortex or phantom permanantly soldered ! so! you get the legal 16" length .. I got the 14.5 since i do not have one!
  
  I did not weigh the weapon!but accourding to pOF theempty weight of the rifle is 7.5 lb
  
  DAveC!