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Joined: Sep 2005
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Campfire Tracker
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Campfire Tracker
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Lets go over the tuning of a home brew gun that ejects 3 feet to the right.
Gas: My guess is that you are on the edge of enough gas with the intermittent stoppages you get.
Solutions: Lighter buffer, lighter spring, check your gas key, lube, gas block or tube issues. I am sure a handful of others.
I may be wrong, I am sure I left a few things out.
NRA Life Member
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Campfire Tracker
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Campfire Tracker
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maybe a worn or light ejector spring too.
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Joined: Sep 2006
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Campfire Ranger
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Campfire Ranger
Joined: Sep 2006
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maybe a worn or light ejector spring too. From his explanation, sounded like his upper was new; he also never said what length gas system he has either. Could well be something other tan just ammo...............pretty hard to tell w/o more info. MM
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Joined: Oct 2014
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Campfire Tracker
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Campfire Tracker
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Lots we don't know here. Could still just be light loads or a poorly tuned rifle.
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Joined: Oct 2007
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Campfire Regular
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OP
Campfire Regular
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maybe a worn or light ejector spring too. From his explanation, sounded like his upper was new; he also never said what length gas system he has either. Could well be something other tan just ammo...............pretty hard to tell w/o more info. MM I think I have a mid length gas system.
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Joined: Oct 2007
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Campfire Regular
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OP
Campfire Regular
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Lots we don't know here. Could still just be light loads or a poorly tuned rifle. If the weather cooperates tomorrow I am going to try something to see if I can find a solution to my issue, I have a Rock River Lar 15, it ejects cases from just about everything I shoot at least ten feet or more, it will put 10 empty cases into a 24 inch circle. I am going to take the upper from my Build and slap it on to the Rock river lower, if the cases eject farther then I would assume the problem is with my lower, possibly the buffer spring, if nothing changes then I would tend to think it's the upper, I took the BCG apart and removed and cleaned the extractor, the extractor spring looks fine.
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Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2005
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oil the carrier and inside receiver really well when they are new.... not grease, oil....
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
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Joined: Jan 2005
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Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2005
Posts: 57,480 |
Lots we don't know here. Could still just be light loads or a poorly tuned rifle. If the weather cooperates tomorrow I am going to try something to see if I can find a solution to my issue, I have a Rock River Lar 15, it ejects cases from just about everything I shoot at least ten feet or more, it will put 10 empty cases into a 24 inch circle. I am going to take the upper from my Build and slap it on to the Rock river lower, if the cases eject farther then I would assume the problem is with my lower, possibly the buffer spring, if nothing changes then I would tend to think it's the upper, I took the BCG apart and removed and cleaned the extractor, the extractor spring looks fine. Ejector spring controls WHERE the empty cases land... FWIW.
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
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Joined: Sep 2006
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Campfire Regular
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Campfire Regular
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I like several AA powders but 2520 has been inconsistent and never really worked in anything for me including the 5.56. There are too many choices for me to put much sweat into building a 2520 load.
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Joined: Oct 2007
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Campfire Regular
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I like several AA powders but 2520 has been inconsistent and never really worked in anything for me including the 5.56. There are too many choices for me to put much sweat into building a 2520 load. I am going into town tomorrow and pick up a pound of Alliant power pro 2000 and see how it works
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Joined: Jan 2005
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Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2005
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I like several AA powders but 2520 has been inconsistent and never really worked in anything for me including the 5.56. There are too many choices for me to put much sweat into building a 2520 load. This is why we quit it in the 90s. It was 200 fps slower and not accurate all of a sudden, this after we'd shot it for years and probably close to 50 pounds or so of it....
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
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Joined: Sep 2006
Posts: 23,631
Campfire Ranger
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Campfire Ranger
Joined: Sep 2006
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I like several AA powders but 2520 has been inconsistent and never really worked in anything for me including the 5.56. There are too many choices for me to put much sweat into building a 2520 load. I am going into town tomorrow and pick up a pound of Alliant power pro 2000 and see how it works While I really like the 2000-MR with heavy bullets, AR-Comp is more flexible across the board with top shelf accuracy................. MM
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Joined: Oct 2007
Posts: 1,267
Campfire Regular
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OP
Campfire Regular
Joined: Oct 2007
Posts: 1,267 |
Lots we don't know here. Could still just be light loads or a poorly tuned rifle. If the weather cooperates tomorrow I am going to try something to see if I can find a solution to my issue, I have a Rock River Lar 15, it ejects cases from just about everything I shoot at least ten feet or more, it will put 10 empty cases into a 24 inch circle. I am going to take the upper from my Build and slap it on to the Rock river lower, if the cases eject farther then I would assume the problem is with my lower, possibly the buffer spring, if nothing changes then I would tend to think it's the upper, I took the BCG apart and removed and cleaned the extractor, the extractor spring looks fine. Ejector spring controls WHERE the empty cases land... FWIW. I went out earlier today and shot a couple of different loads using the lower from my Rock River Lar 15, cases ejected much farther even with AA2520, went to a gun shop and explained the situation, buffer spring replaced with one that is two inches shorter, will go out and see what happens tomorrow.
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Joined: Feb 2004
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Campfire Ranger
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Campfire Ranger
Joined: Feb 2004
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Lots we don't know here. Could still just be light loads or a poorly tuned rifle. If the weather cooperates tomorrow I am going to try something to see if I can find a solution to my issue, I have a Rock River Lar 15, it ejects cases from just about everything I shoot at least ten feet or more, it will put 10 empty cases into a 24 inch circle. I am going to take the upper from my Build and slap it on to the Rock river lower, if the cases eject farther then I would assume the problem is with my lower, possibly the buffer spring, if nothing changes then I would tend to think it's the upper, I took the BCG apart and removed and cleaned the extractor, the extractor spring looks fine. Ejector spring controls WHERE the empty cases land... FWIW. I went out earlier today and shot a couple of different loads using the lower from my Rock River Lar 15, cases ejected much farther even with AA2520, went to a gun shop and explained the situation, buffer spring replaced with one that is two inches shorter, will go out and see what happens tomorrow. This sounds like a rifle spring in an M-4 tube. kwg
For liberals and anarchists, power and control is opium, selling envy is the fastest and easiest way to get it. TRR. American conservative. Never trust a white liberal. Malcom X Current NRA member.
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Joined: Oct 2007
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Campfire Regular
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Campfire Regular
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Lots we don't know here. Could still just be light loads or a poorly tuned rifle. If the weather cooperates tomorrow I am going to try something to see if I can find a solution to my issue, I have a Rock River Lar 15, it ejects cases from just about everything I shoot at least ten feet or more, it will put 10 empty cases into a 24 inch circle. I am going to take the upper from my Build and slap it on to the Rock river lower, if the cases eject farther then I would assume the problem is with my lower, possibly the buffer spring, if nothing changes then I would tend to think it's the upper, I took the BCG apart and removed and cleaned the extractor, the extractor spring looks fine. Ejector spring controls WHERE the empty cases land... FWIW. Went out earlier this morning, new spring did not help, called on a friend of mine who has built a few AR's, we took the Bolt carrier group from one of his AR's and tried it in mine, cases ejected with no problem. When we took my BCG apart he noticed that the gas rings were not aligned correctly, correct that and also installed an O ring under extractor spring, will go out Tomorrow and see if that fixes the problem. I went out earlier today and shot a couple of different loads using the lower from my Rock River Lar 15, cases ejected much farther even with AA2520, went to a gun shop and explained the situation, buffer spring replaced with one that is two inches shorter, will go out and see what happens tomorrow. This sounds like a rifle spring in an M-4 tube. kwg
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Joined: Oct 2007
Posts: 1,267
Campfire Regular
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OP
Campfire Regular
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Went out earlier this morning, new spring did not help, called on a friend of mine who has built a few AR's, we took the Bolt carrier group from one of his AR's and tried it in mine, cases ejected with no problem. When we took my BCG apart he noticed that the gas rings were not aligned correctly, correct that and also installed an O ring under extractor spring, will go out Tomorrow and see if that fixes the problem.
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Joined: Jan 2005
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Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2005
Posts: 57,480 |
OMG, gas rings are about the first thing one looks for. Its so easy. Guess we all failed to think back to bare basics...
Its one reason I never am without a proven totally spare BCG for backup...
Swap it in and all works, you at least know where the problem is.
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
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Campfire Outfitter
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Campfire Outfitter
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After seeing one run just fine with only 1 gas ring, I have my doubts the issue will be solved.
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Campfire Outfitter
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Campfire Outfitter
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Gas key solidly in place and staked?
Let's Go Brandon! FJB
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