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Posted: 10/19/2006 11:19:39 AM EST
[Last Edit: 10/26/2006 1:53:08 PM EST by shadow870]
Basicly I cant get my AR to cycle at all when I manually operate it. I pull the chargeing handle back all the way and then let go, but the bolt only strips the round about 1/2 way out of the mag. The problem occurs just as much with a round form one side as the other. I have tryed it with 30rn D&H mags, 30rnd Bushmaster mags, and an old 20rnd range mag with metal follower. The problem occures regardless of how many rounds are in the mag. I have six 30's and one 20 and it happens with all of them. unless all my mags are bad (VERY UNLIKELY) it must be something with the gun.

Mabey I need a new buffer spring? I cant help but think that if the buffer spring were more powerfull, it wouldnt have trouble pushing the round out of the mag and into the chamber.

What do you experts think? your help is appreciated, thanks.

P.S. I also experance this problem when acctually fireing the gun, just not as often.

Link Posted: 10/19/2006 11:44:51 AM EST
Try locking the bolt back. Insert a loaded mag and hit the bolt release. Will it chamber that way?
Link Posted: 10/19/2006 11:48:01 AM EST
Link Posted: 10/19/2006 11:50:02 AM EST
Link Posted: 10/19/2006 12:24:54 PM EST
But he said it is happing while firing too, but not as much. These guys are right it could be as simple as you riding it home but that little tid bit makes me wonder.

Just curious what type of ammo you are using? Sounds silly but does it happen with no magazine in the rifle? This would be a hammer engaging the firing pin scenario - not likely though. Factory build or customer build? Pics?
Link Posted: 10/19/2006 12:27:36 PM EST
Link Posted: 10/19/2006 12:29:58 PM EST

Originally Posted By Forest:

Originally Posted By SamColt:
But he said it is happing while firing too, but not as much.


Which means what? It's only happening when he loads it - or does it occure during the string. He's kinda vauge about the details.


Good point Forest - I believe teh devul lurks somewhere in the details we need.
Link Posted: 10/19/2006 1:21:33 PM EST
I just gave the whole rifle one hell of a cleaning and tryed again. this time paying close attention to not short strokeing it. I had much better results. out of about 30 manipulations, i still got about 6 falures to feed. the bullet rested up against the lugs of the reciver. the rifle is a 2 1/2 year old bushmaster. and this problem has occured durring strings of fire, but not nearly as often as when i chamber the first round out of a mag.

I am unable to give you guys pics at the moment due to lack of a camera.
Link Posted: 10/19/2006 2:30:21 PM EST
This could be one of many problems! The first question that comes to mind for me anyhow....has your 2.5 yr. old Bushmaster always done this?? And your just now getting around to asking about the problem? Or you may have bought it off someone recently and your pissed now for buying it! heAnother possibility, in which a buddy of mine had this problem with his Bushmaster M-4gery. He called Bushmaster and the Smith there told him the lower portion/edge of the feed ramps probably just need a fine polish, send it in and they would take care of it. Well my bud prides himself on his gun smithing abilities and did it on his own. Long story short....end of problem. I don't know......Just food for thought!!
Link Posted: 10/19/2006 4:05:47 PM EST

Originally Posted By Mortamer:
This could be one of many problems! The first question that comes to mind for me anyhow....has your 2.5 yr. old Bushmaster always done this?? And your just now getting around to asking about the problem? Or you may have bought it off someone recently and your pissed now for buying it!
I would personnally wonder about your mag storage. Did you or the previous owner store the mags loaded? If so you will have a mag spring issue. If so simply go to Wolff GunSprings and replace your springs and followers.
Another possibility, in which a buddy of mine had this problem with his Bushmaster M-4gery. He called Bushmaster and the Smith there told him the lower portion/edge of the feed ramps probably just need a fine polish, send it in and they would take care of it. Well my bud prides himself on his gun smithing abilities and did it on his own. Long story short....end of problem. I don't know......Just food for thought!!


Thanks for the help but almost none of that aplies to me.. bought the gun and mags new and dont keep them loaded. the rifle as only been doing this for a 3 or 4 months. I will take alook at the feed ramp though. I never thought of that. thanks again.
Link Posted: 10/19/2006 4:15:51 PM EST
[Last Edit: 10/19/2006 4:16:46 PM EST by mvician]
Keeping mags loaded does NOT wear them out

How much lube are you using ?

Mike
Link Posted: 10/19/2006 4:31:55 PM EST

Originally Posted By mvician:
Keeping mags loaded does NOT wear them out

How much lube are you using ?

Mike


Average amount I guess. Its real smooth rite now.

And for all future post's, I dont want this thread to turn into an argument about weather or not keeping mags loaded wears them out or not. Thanks.
Link Posted: 10/19/2006 4:42:23 PM EST
Link Posted: 10/19/2006 5:10:47 PM EST
height=8
Originally Posted By mvician:
Keeping mags loaded does NOT wear them out How
Mike


I could not agree with you more!! It will NOT wear out the mag...... But it WILL wear out the spring!
Link Posted: 10/19/2006 5:28:13 PM EST

Originally Posted By Mortamer:

Originally Posted By mvician:
Keeping mags loaded does NOT wear them out

How much lube are you using ?

Mike


I could not agree with you more!! It will NOT wear out the mag...... But it WILL wear out the spring!


Give the misinformation a rest, at the request of the OP.

OP, are the rounds handing up on something or is the carrier?
Link Posted: 10/19/2006 5:45:33 PM EST
Ammo what ammo are you using?

You mentioned it didn't matter what mag you used correct? How many mags and what kind are they? Are they all the same?

And I apologize but I can't resist - mag springs will not weaken or wear from being compressed. I'm sorry but they won't.
Link Posted: 10/19/2006 5:52:38 PM EST
Link Posted: 10/19/2006 6:22:45 PM EST
[Last Edit: 10/19/2006 6:25:48 PM EST by engineer2001]

Originally Posted By Phoebus:
Give the misinformation a rest, at the request of the OP.


For real. The "mag springs wear out/get weak when stored loaded" horse has been beaten way past death, and it's still not true. Ask Larry of CProducts. It's not compression that makes springs weak - it's compressing and uncompressing (cycling). You can push a mag spring all the way down and leave it for years with no bad effects. Chrome silicon springs can take more of those cycles before wearing out, but stainless steel is not bad either.

If you suspect the buffer spring, why not just get another one? What kind of stock do you have - fixed or carbine/collapsible?
Link Posted: 10/19/2006 6:41:11 PM EST
Link Posted: 10/19/2006 6:42:54 PM EST
height=8
Originally Posted By QUIB:
Just taking a Wild Ass Guess here, but separate your upper and lower. Pull out the bolt/carrier and charging handle. Remove the bolt from the carrier. Check the carrier gas key to see if it’s loose. Now flip the weapons upper receiver upside down. Insert the bolt carrier by it self and allow it to slide forward towards battery. Observe the gas tube as it enters the carrier gas key. Does the carrier slide freely back and forth without dragging on the gas tube?


Eureka!! I concur. You may actually have a screw loose heDamn Good QUIB!!
Link Posted: 10/19/2006 6:47:08 PM EST
Link Posted: 10/19/2006 6:51:20 PM EST
I was having a similar problem with my Bushmaster as well (failure to feed). My rifle came with 4 mags, three 30 round and one 20 round. I replaced the springs and followers, but the problem still persisted. As a last resort, I purchased a couple of new mags (from DPMS) when I was at our last gun show and I haven't had a problem since. I only fired about 80 rounds through the new mags, but it was a good sign that no rounds were misfeeding. I hope you solve your problem soon.
Link Posted: 10/19/2006 8:03:30 PM EST

Originally Posted By Mortamer:

Originally Posted By QUIB:
Just taking a Wild Ass Guess here, but separate your upper and lower. Pull out the bolt/carrier and charging handle. Remove the bolt from the carrier. Check the carrier gas key to see if it’s loose. Now flip the weapons upper receiver upside down. Insert the bolt carrier by it self and allow it to slide forward towards battery. Observe the gas tube as it enters the carrier gas key. Does the carrier slide freely back and forth without dragging on the gas tube?


Eureka!! I concur. You may actually have a screw loose Puns aside! Your carrier key screws may be loose? Or the alignment of your bolt carrier key! Either way you should see some type of (Non-Normal) impressions or wear upon this. If that be the case?
Damn Good QUIB!!


Right but instead of going through all of this just see if it happens with the magazine out of the rifle. Right? If it works fine with no magazine present then we rule out the loose screw theory and narrow it down to the mags. Si or No?
Link Posted: 10/20/2006 4:05:08 AM EST
Link Posted: 10/24/2006 1:16:51 PM EST

Originally Posted By Mortamer:

Originally Posted By QUIB:
Just taking a Wild Ass Guess here, but separate your upper and lower. Pull out the bolt/carrier and charging handle. Remove the bolt from the carrier. Check the carrier gas key to see if it’s loose. Now flip the weapons upper receiver upside down. Insert the bolt carrier by it self and allow it to slide forward towards battery. Observe the gas tube as it enters the carrier gas key. Does the carrier slide freely back and forth without dragging on the gas tube?


Eureka!! I concur. You may actually have a screw loose Puns aside! Your carrier key screws may be loose? Or the alignment of your bolt carrier key! Either way you should see some type of (Non-Normal) impressions or wear upon this. If that be the case?
Damn Good QUIB!!


You will have to forgive my ignorance but wich part exactly is the gas carrier key. I belive it is the part that catches the hot gas out of the gas tube and is bolted to the top of the carrier, but im not 100% sure on that. either way, no, the carrier dose not slide very smoothly around the gas tube.

P.S. Sorry it has taken me so long to reply, i have not had much free time or much access to a computer the last few days.
Link Posted: 10/24/2006 1:34:19 PM EST

Originally Posted By shadow870:

Originally Posted By Mortamer:

Originally Posted By QUIB:
Just taking a Wild Ass Guess here, but separate your upper and lower. Pull out the bolt/carrier and charging handle. Remove the bolt from the carrier. Check the carrier gas key to see if it’s loose. Now flip the weapons upper receiver upside down. Insert the bolt carrier by it self and allow it to slide forward towards battery. Observe the gas tube as it enters the carrier gas key. Does the carrier slide freely back and forth without dragging on the gas tube?


Eureka!! I concur. You may actually have a screw loose Puns aside! Your carrier key screws may be loose? Or the alignment of your bolt carrier key! Either way you should see some type of (Non-Normal) impressions or wear upon this. If that be the case?
Damn Good QUIB!!


You will have to forgive my ignorance but wich part exactly is the gas carrier key. I belive it is the part that catches the hot gas out of the gas tube and is bolted to the top of the carrier, but im not 100% sure on that. either way, no, the carrier dose not slide very smoothly around the gas tube.

P.S. Sorry it has taken me so long to reply, i have not had much free time or much access to a computer the last few days.


You are correct on what the carrier key is. I am having a similar problem on my new CMMG upper. But it is getting better as I fire more rounds through it.
Link Posted: 10/24/2006 2:07:41 PM EST
Link Posted: 10/24/2006 3:48:16 PM EST

Originally Posted By QUIB:

Originally Posted By shadow870:

Originally Posted By Mortamer:

Originally Posted By QUIB:
Just taking a Wild Ass Guess here, but separate your upper and lower. Pull out the bolt/carrier and charging handle. Remove the bolt from the carrier. Check the carrier gas key to see if it’s loose. Now flip the weapons upper receiver upside down. Insert the bolt carrier by it self and allow it to slide forward towards battery. Observe the gas tube as it enters the carrier gas key. Does the carrier slide freely back and forth without dragging on the gas tube?


Eureka!! I concur. You may actually have a screw loose Puns aside! Your carrier key screws may be loose? Or the alignment of your bolt carrier key! Either way you should see some type of (Non-Normal) impressions or wear upon this. If that be the case?
Damn Good QUIB!!


You will have to forgive my ignorance but wich part exactly is the gas carrier key. I belive it is the part that catches the hot gas out of the gas tube and is bolted to the top of the carrier, but im not 100% sure on that. either way, no, the carrier dose not slide very smoothly around the gas tube.

P.S. Sorry it has taken me so long to reply, i have not had much free time or much access to a computer the last few days.


Your correct in identifying the gas key.

Slide the carrier only into the upper receiver and observe where the carrier key and gas tube make contact.

The manual states to gently bend the gas tube underneath the hand guards, then drop the carrier back in, and repeat as necessary.

I use a large flat tip screwdriver and gently bend the gas tube inside the upper receiver, in the opposite direction from where it’s dragging.

The method and how/where you bend the gas tube is up to you, but that is where I personally would start addressing this problem.


Upon further inspection of the gas tube I noticed it dose seem to be bent a hair to the left. I have a GG&G non free-float modular handgaurd so perhaps i can stick a screwdriver in one of the top holes and use the gaurd as leverage to move the gas tube into the correct position/shape. Hopefully this will fix the problem. Thanks.
Link Posted: 10/24/2006 4:22:44 PM EST
You may be able to bend it but most likely the barrel nut needs aligned with the cruciform hole in the receiver. That is probably what is misaligning the gas tube.
Link Posted: 10/24/2006 8:10:10 PM EST
One of the most overlooked problems is a mag catch slot milled too low on the lower receiver. This causes the magazine to sit too low in the rifle and makes the rounds hit below the feedramps.

Can you take a caliper and measure the distance from the top of the lower to the top of the magazine catch slot? This distance should be 0.650"

Link Posted: 10/25/2006 5:38:07 AM EST

Originally Posted By shadow870:
i still got about 6 falures to feed. the bullet rested up against the lugs of the reciver. the rifle is a 2 1/2 year old bushmaster. and this problem has occured durring strings of fire, but not nearly as often as when i chamber the first round out of a mag.


This part made me curious. Buddy of mine had similar results on his brand new Modular Carbine few months back. Bullet stuck always on left feed ramp. This made me think it is gas leak, like bolt carrier wouldn´t have enough thrust to push fresh cartridge from magazine.
We went through whole rifle, magazines (a lots of) gas key screws, gas tube to gas block fit, ammunition, buffer spring, buffer, another lower but no help. Problem occured every once in awhile, no matter what we did.

Gas tube to gas block fit was very loose, btw, but that wasn´t problem.

I was about to give up but then we noticed tiny copper particles inside barrel extension. We didn´t notice this earlier since we focused on possible gas leak.
We went through cartridges left over from stoppages and found out marks on those bullets stopped to left side feedramp were different than normally, grooves were significantly deeper and differently shaped.

At this point owner said I´m free to do anything with rifle, it doesn´t work anyway. He was pretty upset since he paid shit load of money to get it.
He even suggested me to Dremel some material off the lugs but I said I wouldn´t remove material from barrel extension but I can do some slight polishing.

Polishing was done with 1000 grit paper wrapped around needlefile with very skeptical feeling but what the hell it could be worth it.

Lo and behold, it worked! Not a single feeding or any other problem in that afternoon. Problem solved.

Last time I asked owner round count after polishing and he told at least 1500 shots w/o single malfunction...

Just my .02 cents.

MN

Link Posted: 10/25/2006 6:37:11 AM EST
I was having this problem a few weeks ago too. Is your buffer spring greased? Many people do this to get rid of the noise it makes when firing. Mine was. As the grease got old and dirty is started clumping up and it was slowing down the bolt carrier return a bit. Cleaned out the tube and cleaned off the spring. No problems since. Bolt closes with authority now. No more lubed buffer springs for me.
Link Posted: 10/26/2006 1:52:11 PM EST
OK. Im finally able to show you guys pics now. here is was the gas tube looks like in the reciver and through the top of my handguards. I think it looks a little bent to the left side of the gun (or bent upwards in the picture).



Also the gas tube dose not run straight along the top of my gun. I cant tell if the gas tube is out of postion or if the handgaurds are not wear they are supposed to be.



Hope this helps you help me. Thanks for all of the replies.
Link Posted: 10/26/2006 1:59:33 PM EST

Originally Posted By scottryan:
One of the most overlooked problems is a mag catch slot milled too low on the lower receiver. This causes the magazine to sit too low in the rifle and makes the rounds hit below the feedramps.

Can you take a caliper and measure the distance from the top of the lower to the top of the magazine catch slot? This distance should be 0.650"



If I measuered what you said to measure, It would seem that the space is actually 0.680" How bad is that? (this is the first time i have ever measuered anything with calpers).
Link Posted: 10/26/2006 2:35:10 PM EST
[Last Edit: 10/26/2006 2:37:24 PM EST by QUIB]
Link Posted: 10/26/2006 2:42:08 PM EST

Originally Posted By QUIB:
Can you re-size and re-post those pics? You’re over loading my dial-up connection!

It could be that your gas tube is cocked to one side because of your barrel nut not being aligned, as already stated above.

Have you tried to straighten out the gas tube?


ETA: Never mind the pics finally loaded up.

And yes, it looks like your gas tube is cocked to one side.


Sorry for th size of the pics. it was my first time.

So if it is the barrel nut, what do i do? something the local smith can fix?

I tried to move the tube with a screw driver but didnt get anywear. wasnt sure about tryin to bend it though, didnt wnat to do more harm then good.
Link Posted: 10/26/2006 3:12:10 PM EST
Link Posted: 10/26/2006 3:47:05 PM EST
I think my local smith can handle all of that, but wear can i get a gas tube? and what do u think about the mag catch being machined to low. that dose sounds like it could be caauseing the problems i have been haveing?
Link Posted: 10/26/2006 4:36:38 PM EST
Link Posted: 10/26/2006 4:41:44 PM EST
[Last Edit: 10/26/2006 4:42:55 PM EST by bad_aim80]
I had the same problem, except i never looked at the gas or key ( properly staked and using two piece handguards not free float) be cause barrel nut linned up. Take off the handguard and see if the barrell nut lines up with the hole in the upper reciever, if not correct the problem as the friction may be slowing it down just enough.

However the fact that you said it happens only on the left side makes me think that the feed ramps are suspect. After manually (pulling back charging handle releasing, and pulling back again to extract round) extracting round are there scratch or gouge marks on the bullet. If so it is more than likely the feed ramps. I had the same problem as i said, use different kinds of mags and ammo, different buffers and springs, still had problem. The only area that had not been looked at was the Barrel and barrel extension where the ramps are located. what i did to remedy my problem was check barrel torque retorque to spec, and also polish feed ramps.

POLLISH FEED RAMPS

there is also another threadover on the troubleshooting area thathas this same problem.
Link Posted: 10/26/2006 5:14:52 PM EST
[Last Edit: 10/26/2006 6:39:28 PM EST by Forest]

Originally Posted By Mortamer:

Originally Posted By mvician:
Keeping mags loaded does NOT wear them out

How much lube are you using ?

Mike


I could not agree with you more!! It will NOT wear out the mag...... But it WILL wear out the spring!



Seriously.....you are a [Inappropriate comment for the Tech areas - Forest]! An indefinately loaded mag spring will not be worn out.


Static tention does NOTHING to a mag spring.......always keep a few mags loaded all the time, and in 30 years they'll still be fine.
Link Posted: 10/26/2006 5:43:36 PM EST
[Last Edit: 10/26/2006 6:40:03 PM EST by Forest]
height=8
Originally Posted By azhammer:
height=8
Originally Posted By Mortamer:
height=8
Originally Posted By mvician:
Keeping mags loaded does NOT wear them out How
Mike


I could not agree with you more!! It will NOT wear out the mag...... But it WILL wear out the spring!



HING


Excuse me.......No need for personal attacks, [Inappropriate comment for the Tech areas - Forest]! ! I was just trying to relay something that may be a Mag Spring issue..... i.e. "Weak Spring!" Obviously that is not the case.
Link Posted: 10/26/2006 5:43:37 PM EST
[Last Edit: 10/26/2006 5:44:28 PM EST by SamColt]

Originally Posted By QUIB:

Originally Posted By shadow870:
I think my local smith can handle all of that, but wear can i get a gas tube? and what do u think about the mag catch being machined to low. that dose sounds like it could be caauseing the problems i have been haveing?


A gas tube can be had from any of the parts dealers in the Industry Section of the site.

As far as the dimensional check that Scott Ryan gave you, I have no idea, you’ll have to ask him for more direction.


quib - back to our discussion about testing to rule out the gas tube. If the mag is removed and he doesn't have any failures going in to battery can it still be the gas tube? Could the "rub" of the tube inside the key and the added force needed to strip a round cause this failure to feed? I'm interested to hear more about the measurement ScottRyan had him take. Amazing what you can learn around here by staying away from GD.
Link Posted: 10/26/2006 6:24:10 PM EST
Link Posted: 10/26/2006 6:32:42 PM EST
[Last Edit: 10/26/2006 6:33:26 PM EST by scottryan]

Originally Posted By shadow870:

Originally Posted By scottryan:
One of the most overlooked problems is a mag catch slot milled too low on the lower receiver. This causes the magazine to sit too low in the rifle and makes the rounds hit below the feedramps.

Can you take a caliper and measure the distance from the top of the lower to the top of the magazine catch slot? This distance should be 0.650"



If I measuered what you said to measure, It would seem that the space is actually 0.680" How bad is that? (this is the first time i have ever measuered anything with calpers).



That seems normal but on the high side. But from the pics, you definately have an alingment problem with your gas tube. I would try to get that corrected first.

Make sure your calipers are square to the part when you measure.
Link Posted: 10/26/2006 7:20:53 PM EST
[Last Edit: 10/26/2006 7:30:36 PM EST by engineer2001]
Where's the flare at the end of the gas tube? All my ARs have a flare that looks like a fatter rim near the very end of the gas tube for the bolt carrier's gas key to lock up on. It sort of makes the end of the gas tube look like a mushroom with the very top cut off from the side.

Your tube looks like a rifle or mid-length tube that's been cut down, or something (or really worn on the end). I'd definitely replace it first like the guys above say. You can get them from everywhere from MidwayUSA to Bravo Company for about $12.


Also the gas tube dose not run straight along the top of my gun. I cant tell if the gas tube is out of postion or if the handgaurds are not wear they are supposed to be.


Looks to me like your handguards are a few degrees too far clockwise, looking down the barrel with the AR shouldered. They don't line up with the flat side straight on the upper and the FSB.

Link Posted: 10/26/2006 8:55:45 PM EST

Originally Posted By Mortamer:

Originally Posted By azhammer:

Originally Posted By Mortamer:

Originally Posted By mvician:
Keeping mags loaded does NOT wear them out

How much lube are you using ?

Mike


I could not agree with you more!! It will NOT wear out the mag...... But it WILL wear out the spring!



Seriously.....you are a .....! An indefinately loaded mag spring will not be worn out.


Static tention does NOTHING to a mag spring.......always keep a few mags loaded all the time, and in 30 years they'll still be fine.


Excuse me.......No need for personal attacks, [Inappropriate comment for the Tech areas - Forest]! ! I was just trying to relay something that may be a Mag Spring issue..... i.e. "Weak Spring!" Obviously that is not the case.


First off, I wouls like to thank everyone for there contribution to my problem. I have learned a great deal so far. I do feel that most of my problem lies with the gas tube and the barrle nuts alingment to the reciver. Im going to take it to the smith tommarow and see what he says. Also, could someone post a pic of a gas tube like what engineer2001 was talking about? I have never seen one like what he discribed. (not that i have seen many anyways)

2nd- I hate to ask another stupid questin, but could someone show me a pic detailing the feed ramps. So I can make sure I understand the advice im getting. It seems I need to spend more time on my AR-15 termanology

3rdly (spoken in a friendly but stern tone)- I would like to AGAIN ask that the subject of "loaded mags wear out springs" be forever dropedin this thread! This topic has been beaten beyond recognition on this site and it dose not matter anyway because none of my mags have been kept loaded. There is also no reason for personal attacks! No one is telling anyone what they can or cant do with there mags. If you feel someone is doing something wrong, fine. Tell them what you think, hope they listen, but if not, O'well, its not your problem!
Link Posted: 10/26/2006 9:30:43 PM EST
[Last Edit: 10/26/2006 9:41:38 PM EST by engineer2001]
The feed ramps are the things that are cut into the bottom of the barrel extension that the bullet tips hit and ride along when the round is being chambered. See the two channels cut out in each of the barrels below (regular rifle ramps and bigger M4 ramps)?



The end of the gas tube that has the flare that I mentioned is hard to photo... checking now to see if anyne has a pic online I can borrow.


ETA: AHA! You can see it in this pic:



That's a rifle-length tube, but all my gas tubes (rifle and two carbines) are like that - fat flare/ring at the end that fits inside the receiver (the left end in the above pic).
Link Posted: 10/27/2006 1:31:10 AM EST
Link Posted: 11/1/2006 10:05:02 AM EST
OK. so Ive just got the chance to drive over to my local smith and he fixed the gas tube alignment problem. Hopefull I will get a chance to acctually fire the gun in the next couple of days, but for now Im just gonna go hand cycle a couple of mags and see how it works. ill post again after im able to fire it.
Link Posted: 11/1/2006 10:27:27 AM EST
I had almost the exact same problem with a gun a bought from a fellow years ago. It would rarely feed more than one or two bullets at a time before it would stop cycling completely. I too was told it had to be a gas tube issue, which under most circumstances would probably be right, but in my case I simply tried new ammo. I realized that the bulk ammo I had been using wasn't strong enough to cycle the gun. By upgrading to XM193 my problem immediately went away and the gun has worked perfectly ever since.
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