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impact

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About impact

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    Austria
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    Martin

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  1. It works. But its magnitude fore sure depends on the load, rifle setup and comp. Get to an indoor range and use a laser, and capture the difference in movememt there, if you're unable to tell during shooting. Or shoot the carbin one handed from the hip without any other part of the body touching the gun. Without any muzzle device it should raise straigt up. With muzzle device attached it will dampen that movement. And if you index the comp to 1 to 3 o'clock, you will sure get the muzzle thrown up to the left. Of course it likely won't be a gamechanger. But it's a piece of the puzzle. And many small things done right will add up. Of course training with the carbine and getting it to know will improve your ability to control it the most. And yes, comps on open pistols will work better because theres twice or three times more powder in the case and probably ten times the pressure level at the muzzle... but you also got less mechanical leverage working for you on these comparably shorter barrels.
  2. It's probably due to faxons design? ..most other 9mm bolts I've seen have tighter and less deep channels for the rear of the firing pin (the part with the disc), so maybe on this particular model the firing pin gets bent more due to less guidance near the striking face. I will machine a bushing and see if that improves firing pin life...
  3. I use the holosun too. Indoor is where it can help quite a bit, but outdoors you lose the dot very quickly. It's however very well built, easy to zero and holds zero pretty well too! It can also be used as a tool for demonstrations, video analysis and for training/drypractice to build certain indexing skills. Like point shooting or shouldering the gun while keeping the barrel pointed at a target and things of that nature. It's not a must have. Just a tool. Also be very aware of using magnifying optics when lasers are around, since they basically also magnify the intensity of the laser for your eye. Kinda like looking at the sun through binoculars, which is very stupid thing to do, obviously.
  4. I also switched to a triggertech adaptable recently and really love it so far. Run it at its almost lowest setting and due to the very light first stage (even if its not a true 2stage trigger, it kinda feels like one) the braking point still feels very solid and I haven't had any ND or bumpfire so far. What I really love about the trigger, is that it seems to keep a very consistent level of pressure necessary to set it off, which even on other high end triggers seems to vary quite a bit depending on lubrication, dirt and use and the break is very predictable. So I'm very comfortable to put pressure on the trigger early and break the shot just the moment the sight picture dictates it. What I also found interesting (especially for PCC) is that it seems to require less bolt travel to cock it (with a pulled trigger) than any other trigger I tested so far. So thats definatly interesting for the short stroke guys I guess.
  5. My approach is, just get a comp that ports gas only in one direction (like the MBX or Armanov) to push the barrel radially and index that to whichever direction the dot is escaping on you to counteract that to the highest possible degree. Or index it so that all of the horizontal part of the movement gets dialed out. Might be possible depending on the setup and shooting technique. There's enough gas left, to actually make use of it, if you "focus" it to help with dot movement, but in conventional brake designs gas and effect just seems to get lost because it gets bled out in all directions and I'm not aware of any 9mm brake design that actually really helps with axial recoil reduction other than by adding weight.
  6. Thanks, I'll try that. Maybe the firin pin channel is a little out of spec too. I also think that because of using a return spring in the blowback design, guidance in a critical area gets lost and firing pin has to deal with a lot of radial forces... I use mainly colt firing pins, but also turned 2 from 223 pins. I use a strike flat wire spring in a H5 buffer short stroke setup. But the first 2 breaks happend during the initial "full stroke" setup.
  7. In ~11k rounds 4 firing pins 1 firing pin retaining pin 1 firing pin spring Whoever designed the 9mm Colt AR really f***ed up the firing pin design...
  8. I zeroed them at the same distance so I get used to only using one set of holdovers. I also used the laser on longer shots indoors before, with uncomfortable left leans or uncomfortable shooting positions. Outdoors useful range drops pretty drastically, but indoors I used it up to 25m without problems.
  9. Just dial the laser dot to the dot of the optic until they both coincide. If your lost which dot is which, just use the pressure pad and turn the laser on and off to be able to distinct between them. It doesn't even take a minute.
  10. I run a Holosun 510C green and a green holosun LS117G, however I only use the Laser with the momentary switch. I got the Laser mounted like a 45° offset reddot and the pressurepad at 12 o'clock in the front of the handguard. Works for me. I don't like the laser beeing constanly on. I just turn it on the instant I need it, and I don't use it all that much, especially outdoors. However they can be beneficial at times, and also help in training with certain things. (diagnosis with camera, mouting the gun, developing a feel for indexing the gun without sights, etc). https://www.instagram.com/martin_impact/?hl=en
  11. When increasing the spring rate, what effect do you guys notice? Is the forward impact of the bolt/buffer causing the muzzle to dip further or probably earlier as spring rate increases and is there a point where you feel a bolt can hit too hard, probably causing harmful deformation of the boltface and chamberwalls?
  12. I also run the holsun 1/4" (i think) riser and a magpul stock with cheek riser. Causes a little more POI offset a short ranges but pays off by feeling more natural. It also puts the sight at the same height as on my competition AR in 223 where I run the same stock setup and a LPVO. So that helps too since I currently spend a lot more time behind the PCC.
  13. Thank you, Sir! Seems I'm pretty close to that with a 11.76oz buffer and 14.39oz bolt (total 26,15oz).
  14. What's the moving mass numbers on that setup approx.? I'm just curious, since I machined my own stainless steel "H5" buffer for my short stroke setup and even though it felt like a pretty clunky buffer at first it seems to work well. Just wanted to know if I'm in the same ballpark as other short stroke setups...
  15. did the almost same thing on my short stroked built a few thousand rounds ago, and was happy to see that that secondary edge seemed to have no negative impact on feeding reliability so far. Locks back like a charm and is handy on those unloaded IPSC starts. I just didn't short stroked it that much, since I didn't tinker with the hammers cocking ramp (yet). Is that a rounded off feather key welded into a milled slot? what buffer weight/setup do you run with such a short stroke and how do you like it?
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