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Posted: 11/30/2009 11:47:47 AM EDT
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I have a new colt 6920 which is giving me two problems.
1. About every 10 rounds of shooting a round will fail to load. I have the bullet half way into the barrel and the bolt pushing forward on the side of the brass. Not sure why it is doing this. 2. The other issue is after the last round is fired the bolt is not staying to the rear but instead ending in the forward position. I have to load a new magazine and put the charging handle to continue shooting. Is this normal? Thanks No nasty comments on it being a colt, please. |
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What kind of ammo?what kind of mags? did you lube well and clean before shooting.
On new rifle use good full powered ammo for the first 1000 rds,check mags they are usualy 95% of failures or more in the M16/Ar15 and lube it well with a good lube like slip2000.if its still short stroking and failing to feed send it back.I think that where your getting both FTFs and FTLs that I would check mags and lube good then see. |
| Its def short stroking, but like everyone else said try different ammo, a good cleaning, lube it up good, and try different mags. If it still short strokes send it back after you have tried to work out the problems. Could just need a good cleaning and a bit more lube. ARs have to be broken in sometimes, yours might need this. |
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Quoted: Undamaged HK mags are usually good to go, but did you try different mags to eliminate the mag from the list of possible problems?I have been using PMC Bronze ammo. 55Grs FMJ-BT. I'm guessing this is not good ammo as I bought it from the range. I was using a HK mag this morning. What's some good ammo to get?? |
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I have tried other mags and it does the same.
I have just finished cleaning it and will try it again with some different ammo. I also spoke with colt and they said I can ship it to them and they will have a look. Just don't want to be with out the gun for two months. I'll keep you all up dated. |
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Quoted: I have tried other mags and it does the same. I have just finished cleaning it and will try it again with some different ammo. I also spoke with colt and they said I can ship it to them and they will have a look. Just don't want to be with out the gun for two months. I'll keep you all up dated. Is the gas tube roll pin in place? |
| The gun should run with PMC 223 ammo. Maybe the gun just isnt broken in yet. I shoot about 200 rounds of USGI ammo through my guns for a break in and that seems to smooth things out. If it doesn't shoot say 200 rounds of Fed xm193 then I would definately box it up and send it back. |
| Use some full powered 5.56mm NATO rounds. Some guns have tighter tolerances than the next lot. If you still have the same issues after using full power ammo then send it back to Colt for a check up. I saw this in an LMT rifle....that was frankened from all sorts of parts slapped together. Can you say Tolerance Stacking? Anyways buddy was using Remington .223 which is very weak and he had short stroking. I gave him some military Winchester 5.56mm rounds and it stopped doing it. At the end of the day he tried his Remington rounds again and not a problem- so it was broken in. |
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OP, first off, how familiar are you with ar-15s and the platform?
Second, all the posters who instantly say send it back either lack knowledge, or are A-holes 
Clean, lube, different ammo, different mags, 2-300 rounds. Don't even think about sending it back until then. |
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My 6940 eats crappy china ammo from the '80s without a hiccup. It is my "worst case scenario" testing ammo. I have other rifles that won't cycle or eject with it.
Colt rifles tend to be a little loose and should eat nearly anything. All of mine have been problem free through the years. There is something wrong. Send it back and keep us posted on Colt's response. |
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This is a big disappointment in my book. Granted that all manufacturers produce a lemon once in a while, but it is still a disappointment having to send your rifle back because it chokes straight out of the box. All of my Colts ran fine right out of the box without having to be clean and lubed first. This is something that you should send back to Colt and have them either fix the problem or replace the rifle - and send you a big "we apologize for the inconvenience" letter and a nice gift certificate for selling you a lemon.
Maybe I've been "lucky", but with my experience, "clean and lube first" should not be the case with a brand new Colt straight out of the box. I just purchased a Colt 6721 a couple of months ago and it saw 700 rounds down the range on its first day without a hiccup and I didn't have to clean and lube it first. Sorry to hear about your problem  and I hope you'll get it resolved soon.
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Quoted:
just send it back. if it was a new tv and it didnt work you wouldnt try to fix it . its a new gun, it should have zero problems. just because its an AR they should not be held to less of a quality standard than any other firearm. I tend to agree with this post. Even my Olympic Arms ran flawlessly for hundreds of rounds straight out of the box. |
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Quoted:
just send it back. if it was a new tv and it didnt work you wouldnt try to fix it . its a new gun, it should have zero problems. just because its an AR they should not be held to less of a quality standard than any other firearm. As said above M855 or any other 5.56 (not .223) to break in. I have followed the below regimen for 22 years for breaking in AR's and it has never failed. It has helped in identifying issues that were easily resolved. 1. Inspect, clean and lube well. 2. Dry cycle action 100 times manually, not letting bolt slam home but just cycle by hand.. 3. Run 500 rounds of 5.56 factory ammo through gun using quality mags. This is a personal regimen that has worked with over 12 of my personally owned Ar's and more freinds and clients than I can count. The only problems I ever encountered was one bad Colt extractor and one Bushmaster that had a broken firing pin.. I have never returned a gun for short stroking as it was always taken care of with 5.56 ammo/ mag replace and or cleaning. Most of the time I will break down wipe of and relube BCG and rails just to do it. |
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Quoted:
This is a big disappointment in my book. Granted that all manufacturers produce a lemon once in a while, but it is still a disappointment having to send your rifle back because it chokes straight out of the box. All of my Colts ran fine right out of the box without having to be clean and lubed first. This is something that you should send back to Colt and have them either fix the problem or replace the rifle - and send you a big "we apologize for the inconvenience" letter and a nice gift certificate for selling you a lemon. Maybe I've been "lucky", but with my experience, "clean and lube first" should not be the case with a brand new Colt straight out of the box. I just purchased a Colt 6721 a couple of months ago and it saw 700 rounds down the range on its first day without a hiccup and I didn't have to clean and lube it first. Sorry to hear about your problem and I hope you'll get it resolved soon.All reliability aside. I have seen cleaning patches and other debris in barrels over the years. I have seen barrels and actions packed with grime, grease, oil and cosmoline from the factory. Colt usually does a good job of keeping them clean but I would not trust my safety to any one for something (inspection) that takes 5 min or less.  Very unsafe to suggest one should not clean and inspect.
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If you do not trust the weapon send it back. If you are confident you are competent to identify the issue and resolve it your self. Then you got it. However if I am not confident in a weapon I will not keep it. I do not care what name it bares. The first thing to do is check the action for any glitches. Cycle the action manually. If it is smooth from start to finish. It is likely a ammo or gas problem. Good luck. Let us know what you find.
And only keep a weapon that you would trust. |
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Here are some steps to help you trouble shoot: 1) Check for Ammo issue... Commercial ammo does not run as hot as Milspec ammo, and some lots of commercial ammo may not be strong enough to cycle the weapon. Try a completely different type of ammo. If the weapon works correctly then you may have some bad ammo. This is becoming a more common problem with some of the low cost imported ammo, especially with milspec sized gas ports like Colt, which are smaller than the overgassed ports of some other makers. 2) Lube and clean the rifle. Pull out your manual and properly clean the weapon. Recent Colts often have this brown gummy resin stuff on the bolt. 3) Check the Gas key. If the key is loose, the gas system will not hold enough pressure to fully cycle the weapon. 4) Check the gas rings. I know the gaps in the gas rings do not need to be staggered, and that it is a myth that they do. Inspect the rings, to make sure there are 3 of them, and that they are installed properly and that none are broken. Disassemble the carrier group, insert the bolt into the carrier, and hold the carrier vertically in the air. The bolt should not fall out of the carrier. Assuming its not one of those, then it is likely something it needs to go back to the factory for. Could be that your FSB is partially obstructing the gasport. I think you should make sure to eliminate the above causes first IMO... |
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I had the same exact problem with my 6920 when I first got it using PMC. It was FTF and short stroking about 50% of the time the first time. Broke it down again, cleaned again, several different PMAG's and the included Colt mags on the second trial and still had the same problem.
Then on the second session I mixed in some Wolf and it would run perfectly for 200 rounds, then I would load the PMC and back to the problems. Then shot enough Wolf rapid fire until it smoked and no problems. Dumped the PMC finally and have shot XM193, American Eagle .223, WWB 5.56 and .223, Wolf, Atlanta Arms re-mfg, Brown Bear, and whatever else was laying around and have not had a single round failure in those 1500+ rounds since I got rid of the PMC. Maybe it wasn't broken in and was too tight for the PMC I don't know. All I know is that I haven't had another single failure since I got rid of it. ETA: Maybe it is broken in enough to run it, or I had a bad batch of PMC. I'm not going to buy any to test it out but if someone in ATL wants to experiment I will trade them some rounds for curiosity's sake. |
| I picked up my 6920 two weeks ago and the first thing I did was clean it cause there was brown gummy/sticky stuff all over the inside... Cleaned it off with clp then shot 200 rounds of PMC without issue... I could totally see it not working if the shipping preserve was left in it... |
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Quoted:
I picked up my 6920 two weeks ago and the first thing I did was clean it cause there was brown gummy/sticky stuff all over the inside... Cleaned it off with clp then shot 200 rounds of PMC without issue... I could totally see it not working if the shipping preserve was left in it... THIS! Always at least run a brush and a patch down the bore of a new gun. You could blow yourself up with an obstruction or there could be some preservative in the chamber or barrel that you don't want to cook into carbon spackle. |
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Quoted:
Dumped the PMC finally and have shot XM193, American Eagle .223, WWB 5.56 and .223, Wolf, Atlanta Arms re-mfg, Brown Bear, and whatever else was laying around and have not had a single round failure in those 1500+ rounds since I got rid of the PMC. That's because PMC runs 200 fps slower than the average commercial .223 load and 400 fps slower than mil spec ammo. PMC is grossly underpowered, but most colts will run it. The other factor is that COLT gas ports are mil spec...i.e. smaller than aftermarket guns which are often OVER gassed to accomodate for junk ammo. There still could be a gas leak issue. I had a carrier key bolt where the key felt tight, but gas was leaking bad and giving me short strokes. |
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Quoted: its a new colt 6920, ammo should not matter. it should eat even wolf. my old colt "20, sp1, 1/12 eats wolf no problem out of alluminum mags. I agree, PMC is no prom queen but it's better than a number of lesser types of ammo that people shoot everyday. It might be a tight gun but I don't believe it is the ammo he has mentioned. I've seen a number of new rifles that do this out of the box but once babied through 100 rounds they cycle just fine. As mentioned make sure it is lubed to the point of being wet with this specific problem. |
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Quoted:
its a new colt 6920, ammo should not matter. it should eat even wolf. my old colt "20, sp1, 1/12 eats wolf no problem out of alluminum mags. Ammo does matter because the 6920 uses a smaller gas port...as per mil spec...than many other guns. Bushmaster and other makers use a larger gas port because they know people are going to shoot weak ammo through the weapons so they make up for it by feeding the action more gas. This helps the weapon function with underpowered ammo, but it makes gas port erosion more of a problem down the road. Your "old" Colt might function just fine with wolf because over time the gas port has eroded (normal wear on an AR) and it's letting more gas through than a NIB 6920. Your "old" Colt is also probably well broken in and runs a bit more smoothly than a NIB 6920 that has yet to break in good. As for the problems here I would suggest trying ammo that is closer to the mil spec stuff...like Privi-Partizan's M193 clone load...and see how that works. |
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Quoted:
OP, first off, how familiar are you with ar-15s and the platform? Second, all the posters who instantly say send it back either lack knowledge, or are A-holes
Clean, lube, different ammo, different mags, 2-300 rounds. Don't even think about sending it back until then. This, BTW I broke in 3 Colt 6940's with PMC Bronze (1000rounds total) without a hiccup. |
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