[LMKnucklehead]

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...

 

[Darebear]

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.

 

[Ed L]

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.

 

[deeHKman]

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...

 

[Ed L]

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.

 

[mew]

try a new one here; McMaster-Carr its 1mm x14 item 9262K106

 

[orfeo]

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

 

[williamthewolf]

you probably did receive the wrong ones.. strange! hope it works out though when you get new ones.

 

[azimuth]

Maybe your barrel is to small...hehe.



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

 

[Ed L]

Okay, finally got it in. Not even sure how, but all is good.

Thanks, guys.