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Suggestions on a BCG malfunction?

 
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  #8  
Old 03-13-2013, 02:15 PM
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Re: Suggestions on a BCG malfunction?

Quote:
Originally Posted by c_bass16 View Post
That sounds like more of a gas problem than anything. The reason it's hard to extract the spent round after it DOES NOT eject, is because it expanded in the chamber without rearward extraction at the same time.
Pivotal for proper extraction.
If it where a gas issue the bolt wold still open. It sounds like a lot of things could be wrong. Starting with the gas tube to gas key fit. I have also seen some bolts that could be assembled backwards. There may be something under the hammer not letting it close. If other bcgs work in the rifle then we have to look at the bolt.
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  #9  
Old 03-14-2013, 08:54 AM
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Re: Suggestions on a BCG malfunction?

MSALM has very valid points. I just ran across a guy who's new AR would short cycle. Finally found blue locktight in the gas key! Seems the company guy staking the key wanted to make sure the screws wouldn't walk and got some down the tube by accident. Cleaned out and function restored. MSALM says to take it one component at a time; sage advise. Be of good cheer, you will find the source of the problem and I bet it's simple to fix! It just may take a bit of looking and testing. You've got good resources in MSALM and ICANHITHIMMAN. Trust them.
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  #10  
Old 03-28-2013, 08:57 PM
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Re: Suggestions on a BCG malfunction?

This is not an unusual problem.

Literally, just finished helping out a friends AR tonight.

#1 - LUBE the buffer tube, spring, and buffer. Lube the tube, outside of spring, outside rear of buffer (slides on the inside of the spring), and the large rounds of the buffer. I HIGHLY recommend STOS from Ponsness Warren - 100% synthetic, does NOT sling, and lasts a long time. A little dab will do you.

#2 - Polish the chamber! Flitz or other NON gritty metal polish on a shotgun bore mop with a low speed drill is nothing short of wonderful. DOWSW with carb cleaner (pull the gas block first).

#3 - lube the BCG. Again, a dab here and there...and manually cycle the bolt when it is out.

#4 - ammo - if you are reloading, 16" barrels, generally operate better at max loads.
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  #11  
Old 03-29-2013, 08:19 AM
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Re: Suggestions on a BCG malfunction?

Acloco is right on; but heed his advise that a little dab WILL do ya! Some even say to use a very light oil for this. If it's too much of any lube; it will attract dirt and can retard function. Neither are good things. But do lube it. The polishing of the chamber is very good,too. When you lube the BCG, I use a light oil just before shooting and lube each lug of the bolt and a little dab on the carrier sides. The wear areas. After cleaning the rifle and BCG; before I install the bolt I lube the gas rings, just behind the gas rings, the cam pin, and around the ejector. I also lube the firing pin for the same reason, and all this oiling also helps cleaning the carbon off. Rub around with a finger to spread it overall. LIGHTLY! Except the lugs, I keep them wet. It will smoke at first shot or two, but it is a good thing. You may also want to look into a flat chrome silicon buffer spring. You won't buy but one, they last.
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  #12  
Old 03-29-2013, 08:33 AM
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Re: Suggestions on a BCG malfunction?

Your both way off, lube will not retard the function in any way what so ever the more the better! AR are meant to run WET not dry if you think your adding to much add more! If the BCG does not visible look WET you don't have enough on there! This issue has persisted since NAM and I'm not sure it will go away anytime soon. Lube your BCG then lube it some more and then more, the biggest cause of malfunctions in this system not related to bad mags in not enough lubrication.

"The golden rule in weapons lubricant is you can run a gun dirty and wet, but not dirty and dry" LAV
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  #13  
Old 03-29-2013, 09:20 AM
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Re: Suggestions on a BCG malfunction?

ICANHITHIMMAN, I should have said keep the recoil spring lightly lubed, oiled actually is best. But I agree, wet the BCG ! I actually greased my recoil spring too much and it did, in fact, retard the action. Cleaned it up, left a film on it and it runs properly now. I do run all my BCGs wet- wet.
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  #14  
Old 03-29-2013, 09:55 AM
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Re: Suggestions on a BCG malfunction?

If we were still living in the previous century you would be right.

It is ok to try something new.
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