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AR15.COM
4/10/2012 5:05:30 PM EDT
Does anyone happen to make a calliber conversion .40 to 9 for any of the hk models.
4/10/2012 7:10:29 PM EDT
[#1]
EFK does but as with any conversion that uses a smaller sized case head (9mm) in a larger sized bolt face(.40), there may be extraction problems.  When the extractor is new they usually work OK but as the extractor gets worn they tend to become jam-o-matics.
4/17/2012 11:50:33 AM EDT
[#2]
I have one of the 40-9 EFK barrels and it has been fine for range purposes.  I'd say I get 1 or 2 stoppages every range trip (which is 200 rounds or so).  I did buy 9mm mags to use with it.
4/17/2012 1:28:19 PM EDT
[#3]
Good info. Thank you.
4/20/2012 5:02:19 AM EDT
[#4]
Supposing you got a new barrel, will using 9mm ammo in a .40 gun cause any damage or wear to the extractor that will cause problems when reverting back to the .40 config?
4/23/2012 5:41:47 PM EDT
[#5]
I've had no issues and I have 3 40-9 converions (Sig 229, Glock 23, HK).  In the long run extractors are cheap anyway.