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Discussion Starter #1
Hi,

I bought a used HK45 that came without the green O-ring on the barrel.

I ordered some O-rings and they came in black, which is listed as working for the HK45.

But when I manage to slide them into their notch in the barrel, they do not stay in the notch once the barrel is in the slide. They slide out of place and all around the barrel.

This occurs whether I put them into the notch in the barrel and then slide the barrel into the slide, or if I slide the barrel into the slide without the O-ring, let the barrel protrude a bit, and then slide the O-ring into its notch. As soon as I move the barrel back in the slide, the O-ring slides out of its notch.

Any ideas?

thanks

In fact, the barrel with the O-ring in
 

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If the barrel has a serial # matching the pistol frame, then you can send it to H&K for warrantee/repair work. If the barrel is a replacement or aftermarket, the bore at the front of the slide might not be machined open enough to allow the O-ring. Some O-rings I have seen are green in color and might be a thinner O-ring. You can call H&K in Georgia and tell them your serial #, then buy some O-rings from them they say were issued with the pistol if that is the case? If they say that your pistol wasn't issued with a O-ring barrel, you have the answer!

I hope this helps...
 

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The black and green O-rings should be the same size. Are you lubing the O-ring before putting it on or putting it on dry? I would try sticking it in there dry.
 

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Discussion Starter #4
Thanks, LMKnucklehead,

The barrel and the serial number of the gun match, so I don't think it is a replacement barrel.

The barrel does have the slot for the O-ring.

If it is any difference, the gun is an American made HK45 full size.
 

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I would get a nylon like brush and clean around where the o-ring goes, then do a good cleaning around(inside the frame) where the barrel goes thru the frame. Might have a very small amout of most anything pushing it off. Plus i put a small amount of oil aound the ring as Dare said, good luck...
 

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Discussion Starter #6
Thanks, guys.

The gun, though bought used, came heavily greased.

I cleaned the gun before and added lube to the O-ring and still no luck.
 

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Sounds like you definitely received the wrong o-rings. Call HK directly and get it from them.
 

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Maybe your barrel is to small...hehe.



Could be that the O ring was exposed to the wrong solvent causing it to swell.
 
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