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  1. HK LONG GUN TALK
    Looking for experience shared by other armourers on the relation between bolt gap and function From my understanding, the MP5 has a "sweet spot" for the bolt gap at 0.25mm. HK literature specified 0.25mm to 0.50mm as the range for the bolt gap. From personal experience; Failures to Cycle...
  2. HK PARTS AND ACCESSORIES FOR SALE
    Semi Auto Bolt Carrier - 9mm - USC, UMP - $349.95 USA Semi Auto Bolt - 9mm - UMP - $369.95 HKParts.net Semi Auto Bolt Group - UMP .40 - $369.95 USA In stock and ready to ship today. HKPARTS https://www.hkparts.net/ (801) 987-3494
  3. HK CLONE TALK
    Is there any difference in the bolts for a SA USC and a FA UMP aside from the bolt height on one side and the tungsten filling? I would assume there is some kind of area that trips the release lever on the FA bolt, where that doesnt exist on a SA bolt...but I cant find photos that look...
  4. HK LONG GUN TALK
    Have an old match MP5 who's bolt gap is nearing .25mm (at .28mm) It's probably got 10k rounds through it AFTER I got it and it was in poor condition. I added +8 rollers to it and the gap is now at 0.38mm but the rollers don't slide into the locked or out of the locked position without a bit...
  5. HK PARTS AND ACCESSORIES FOR SALE
    Semi Auto Bolt Carrier - 9mm - USC, UMP - $349.95 USA Semi Auto Bolt Carrier - 45 - USC, UMP - $349.95 USA Bolt Group - UMP .45 - $369.95 USA Semi Auto Bolt - 9mm - UMP - $369.95 HKParts.net Semi Auto Bolt Group - UMP .40 - $369.95 USA In stock and ready to ship today. HKPARTS...
  6. HK PARTS AND ACCESSORIES FOR SALE
    SOLD. ---
  7. HK ROOKIE CORNER
    Hi all, My C93 has a bolt gap of .005" . I just bought it and it seems like it hasn't had that many rounds through it, maybe 200 or so based on the condition of the receiver. Here's the imgur album: http://imgur.com/a/nSgniHi My questions are: Should I preemptively buy some + rollers for when...
  8. HK PARTS AND ACCESSORIES FOR SALE
    In stock and shipping daily! Ejector Lever For All HK UMP, USC's - $39.95 Heckler & Koch German UMP .40 Bolt Group - $649.95 Heckler & Koch Bolt Catch Spring - HK UMP, USC - $7.95 Heckler & Koch USC, UMP .45 Extractor - USA - $39.95 USA German USC .45 Bolt Group- Incomplete -...
  9. HK PARTS AND ACCESSORIES FOR SALE
    HK UMP 45 - Semi Auto Bolt Carrier Complete with Ejector Includes Extractor Includes Firing pin Retaining Pin Includes Ejector Marked .45 Auto just like the OEM carrier The semi auto bolt group is required for HK USC to HK UMP caliber conversions. You can get it here...
  10. HK PARTS AND ACCESSORIES FOR SALE
    HK 416 Bolt Group Complete - German - $999.95 Heckler & Koch HK 416 Bolt Head Complete - German - $329.95 Heckler & Koch HK MR556 & HK 416 Firing Pin - German - $49.95 Heckler & Koch HK 416 Bolt Head Incomplete - $199.95 Heckler & Koch HK416, MR556 SS Firing Pin - US Made - $29.95...
  11. HK PARTS AND ACCESSORIES FOR SALE
    MP5 & HK94 Firing Pin Spring - German - $9.95 Heckler & Koch Roller Retainer Spring - HK Action 3 - $6.74 Heckler & Koch MP5 40, 10 -4 Roller - $19.95 Heckler & Koch Locking Piece - Extra Low Impulse For MP5 40/10 - USA - $49.95 HKParts.net MP5 40, 10mm SD 110 Degree Locking Piece -...
  12. HK PARTS AND ACCESSORIES FOR SALE
    HK German USC/UMP Cocking Handle Assembly- Used - $44.95 Heckler & Koch HK USC, UMP Firing Pin Spring - $9.95 Heckler & Koch Ejector Lever For All HK UMP, USC's - $39.95 Heckler & Koch HK USC, UMP Firing Pin Assembly Complete - German - $79.95 Heckler & Koch USC, UMP 9mm Semi Auto Bolt...
  13. HK LONG GUN TALK
    BASICS: - Price: $1250 - Bore: Looks pretty great. Possible VERY shallow pitting in one of the grooves for well under an inch of it, or some especially tough carbon fouling, or me seeing things. Rest of the bore shines bright and rifling is about as good as any new gun I've ever seen. -...
  14. HK CLONE TALK
    Ive fired about 200 rounds through it so far with no issues on this, but yesterday at the range I couldnt get the bolt to close completely in battery. I always let the bolt slam with the hk slap technique, and I noticed that it will only close when the rifle is pointed down. When I point the...
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