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Discussion Starter #1
Discovered today that my MP5 barrel has a bulge in it (can feel it on the outside and see it on the inside). IGF did the original work to the gun (was a 94), but I'm not too excited about trusting UPS with it. Any recommendations on someone in Colorado that can do this? Or instructions I can give to a competent gunsmith a press to do it? Recommendations on where to get another barrel? (want a 3 lug). Thanks.
 

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Hkparts has a barrel. Chopstix kid and ghilliebear can do the barrel job.
 

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Be fortunate that this occured with a cold-hammer forged HK barrel. Other barrels and you might have found out in a much more violent manner. HK specifically tests the MP5 barrel to "bulge" and not split or fragment. Because of HK's manufacturing processes for the steel itself and their CHF process, the uniformity of its composition allows the barrel to bulge uniformly. As such, it is claimed that an MP5 will loose no accuracy (distance unknown) as long as the bulge is greater than 4mm from the muzzle.

Ok, enough with the history lesson. While it is not my place to assure you of mailing integrity, I find USPS Prioroty Mail with adequate insurance and dlivery confirmation has always served me well. Optionally, USPS Registerd Mail is one of the safest ways to ship a package and is my preferred method of shipping items greater than $5000 in value.

HKParts.net sells the RCM cold-hammer forged barrels. While they are CHF, they have not been tested like the German CHF barrels have been (bulge test). They also have been nitride treated which makes them a bit more resistance to wear, but can also increase its brittleness. What does this all mean? Your guess is as good as mine. All I can say is they are are excellent barrels. I have installed dozens of them.

Given that your gun is an HK94, you may wish to consider a factory German MP5 barrel. They can be found from time to time and are typically only about $100 or so more than a new RCM barrel.
 

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Be fortunate that this occured with a cold-hammer forged HK barrel. Other barrels and you might have found out in a much more violent manner. HK specifically tests the MP5 barrel to "bulge" and not split or fragment. Because of HK's manufacturing processes for the steel itself and their CHF process, the uniformity of its composition allows the barrel to bulge uniformly. As such, it is claimed that an MP5 will loose no accuracy (distance unknown) as long as the bulge is greater than 4mm from the muzzle.

Ok, enough with the history lesson. While it is not my place to assure you of mailing integrity, I find USPS Prioroty Mail with adequate insurance and dlivery confirmation has always served me well. Optionally, USPS Registerd Mail is one of the safest ways to ship a package and is my preferred method of shipping items greater than $5000 in value.

HKParts.net sells the RCM cold-hammer forged barrels. While they are CHF, they have not been tested like the German CHF barrels have been (bulge test). They also have been nitride treated which makes them a bit more resistance to wear, but can also increase its brittleness. What does this all mean? Your guess is as good as mine. All I can say is they are are excellent barrels. I have installed dozens of them.

Given that your gun is an HK94, you may wish to consider a factory German MP5 barrel. They can be found from time to time and are typically only about $100 or so more than a new RCM barrel.
And there you have it. From the horses mouth himself. Not calling you a horse or nothing chops!!
 

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Discovered today that my MP5 barrel has a bulge in it
Did you spit in it after quaffing down a few Viagra? :biggrin:

What ammo were you using? What screwed the pooch? WWB?
 

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Have you noticed any accuracy degradation? An SOT friend of mine has a post-86 mp5 that has multiple thousands of rounds down the tube since experiencing a bulged barrel. There has been no affect on accuracy and my friend has no plans to have it re-barreled until he notices an issue in this regard.

I would shoot it at 50 yds and see what it is doing accuracy wise, then buy a German HK barrel when you find one, keep the new barrel for future install, then keep shooting the bulged barrel until you notice it is opening up.
 

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Discussion Starter #8
I'm not sure what caused the bulge as I believe it has been there for awhile. I shoot mostly my own loads which I've shot in many guns for years without incident. I certainly know what a squib sounds and feels like and don't recall having any in this gun, so it's a mystery.
 
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