tk4
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Posts posted by tk4
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How about with 68gr bullets?
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Will I have a problem activating Larue flash targets using a 14.5" barrel w/ xm193 55gr ammo- at 300yrds?
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I had already bobbed off the milspec hammer.
I backed out both screws a little, adding a little pre-travel and over- travel. Worked fine after putting about 200 rounds through it.
Need to get at least a couple hundred more through it.
Thanks.
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I am the dept armorer.
It was to save a few bucks. It sounded like a mil spec hammer would work fine.
Can I just purchase a JP hammer to drop into the other jp parts, or do you need to buy a whole set together?
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With the mid and the rifle length gas, I get that we want some time past the gas port before the bullet exits the barrel. Makes sense. Give the gas time to get back to the BCG. It makes sense that if the gas got there too soon while the system is still under a lot of pressure and started pulling on the BCG that things could get rough. That makes sense. How does that work with the 14.5" barrel? The gas is going to be pulling on the BCG for a while. Yet the post indicates that this setup (gas port at 7.8, barrel 14.5) is an ideal "dwell". What am I missing?
Mark
You are not really missing anything. Although I do not think it was explained very well the importance of the distance from the chamber to the gas port, as it relates to the peak pressure in the chamber at extraction. This is the secret to the whole balancing act. It boiles down to this, the closer to the gas port the chamber is the higher the pressure in the chamber will be (at the moment of extraction), so, it is neccessary to slow down the bolt carriers rearward movement to allow pressure to drop. This is typically done by using more mass (heavier buffer). Depending on the size of the gas port in the bbl you are using, and the ammo, will dictate what weight buffer you need to have it run reliably. Sometimes it takes a little trial and error. If you look at the pressures in the chart, its clear that their is a huge differance in peak pressures between the differant gas systems, and all have less to do with dwell time than chamber to gas port distance. Hope this is helpful.
So, does this mean that mid length gas should be "more ideal" for a 14.5" barrel as opposed to carbine length, as stated above?
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Installed a JP standard trigger using my existing hammer. Everything is set up and works per the instructions. But, out of about 150 rounds fired I had 3 or 4 misfires. I believe the hammer was following, but was not firing a 2nd round. This only happened when I was attempting quick follow up shots.
The disconnector seems to be timed correctly.
Could this problem be caused by not enough pre-travel in the trigger?
I am using the red JP trigger spring. This is for a patrol rifle.
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Take a look at Johnson Tactical for a barrel. He is one of the dealers in the classifieds here. I have an upper on order from him. It will have the Nitrided barrel that is supposed to have the accuracy of a stainless barrel, but should be durable like a chrome lined barrel.
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Yes, you need to cant it a little more with the Burkett, but it is not much more. If you picked up one and then the other,each mounted on a rifle, I don't think you would notice much difference. I held up the two mounts, not mounted to a gun, back to back and you can see the Burkett is offset a little further.
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It appears the Burkett/RMR is canted a few more degrees to the right, but I couldn't tell if there was any height difference. My scale showed the Burkett/RMR without wings to be about 1.5 ounces lighter than the Larue/H1.
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After having sold the Dual illumination model, I would think the brightness adjustment of the RM07 would be desirable. The wings easily bolt off the Burkett mount. If the RMR sights are as durable as they say, you should not need the wings.
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It will stay as is. Thanks for the input.
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Just seems like it adds unnecessary weight out front where I don't want it. I guess I am to used to my 12.5" duty gun with a pencil barrel. I guess I should be more concerned with reducing my own unnecessary weight.
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Has anyone cut off the extra long sunshade on their Kdot? Would this cause any problems?
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If the legs are not extended, can it be used as a mono pod?
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Would a grip pod be legal if the legs are not extended?
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I guess I'm going to have to make the 8+ hour trip for this one. Are the longest shots still going to be around 300yrds? I assume that is stage 11. How big will those long targets be?
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I get my recoils from Shooters Connection. I bought the Apex competition spring kit to get all the springs.
Shaun,
Are you running all three springs from the Apex competition spring kit? Any light primer hit problems at all?
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I have been considering that 9L also. I would have taken it if it had the welded over travel option on the Burwell trigger, but the owner said it did not.
Can you tell us how much extra for that option Dan?
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Is there going to be a Steel City Carbine Championship match this year?
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I see this one is scheduled for late April. Does anyone have info on it?
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Can you have 2 optics in magnified centerfire division?
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You guys going to try to make this a STI contingency match?
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How can I get info on the High plains carbine championship June 25th & 26th. The link shows that it is a shotgun match.
Steel City Carbine/Pistol 2-Gun Match
in Multi-Gun, Rifle & Shotgun Match Announcements
Posted
Is the match still on? Wondering if it is a bad idea to travel to the Birmingham area after the tornado.