Armory Sponsor
Posted: 1/5/2014 8:38:13 AM EDT
|
Hi Guys,
I just bought a used HK clone Vector V53 pistol I want to SBR. HOWEVER, Upon taking the gun o the range I found it is VERY hard to charge. WAY harder than my HK93. I did a little net research and found out how to check the bolt gap. Mine measures .031 thousandths. It appears that it is way out of range, from what I've found they should be about .016 bolt gap. This explains why I got such a good deal on it! - about a grand off Broker. The big question is how do I fix this, I have a machine shop at my disposal and consider myself a proficient if not prolific kit builder. However, I have little to no experience with H&K guns, only owning a genuine 91 & 93 that run flawlessly. Please help! |
| Going to have to send it in. I wouldn't suggest using smaller rollers. That is a lot of gap to take out. Either have Vector take care of it, or send it to a smith. I suggest giving Jeff Walters a call. You're .011 above the Max of .020. Is this gun brand-new? If so, it will "break in" a little, but no where near that much. As the rollers in the bolt-head wear down that gap will shrink. |
|
No It's a used gun, Like I said I suspect that is why I got a deal on it. How would a smith fix it, Is the barrel trunnion in too far? or not far enough? I guess I don't understand enough on how these guns work mechanically. I think I understand the theory of the delayed inertia lock, but the actual mechanics of it escape me.
|
|
Quoted:
No It's a used gun, Like I said I suspect that is why I got a deal on it. How would a smith fix it, Is the barrel trunnion in too far? or not far enough? I guess I don't understand enough on how these guns work mechanically. I think I understand the theory of the delayed inertia lock, but the actual mechanics of it escape me. I don't know if Vectors warranty extends beyond original buyer, or what. I have 1 Vector and it has a 5-year factory warranty, I assume it follows the gun, but I have never had to take advantage of it. There can be several reasons your gun has such a high bolt-gap and since you have said it's used, we don't know what previous owner(s) have done to it. At this point, to save you a wild goose-chase, give Jeff Walters @ PCS a call. He knows more than I can pretend to, and will help you identify what the cause may be, and an estimate of repairs. ETA: SO I have been thinking about this a bit, and heres kind of where I am at- With the HK roller-delayed blowback, the rollers allow the the locking piece to push the bolt head further towards the chamber when bolt is forward. Smaller rollers allow bolt head to go further forward, which is why as you shoot the gun, over time it will get smaller. Standard HK rollers are 8.0mm. Each step up or down in rollers is approx. .004". So to go from .031 to .020 (which is HK's max) you'd need to close that gap .012", requiring a set of -6 rollers. My concern with that is that there might be another more serious issue, and even after spending $30 on two rollers and getting them all changed out, you wont have addressed the actual issue. With it being used, if the problem were reversed and too small of bolt-gap, we could assume it was shot quite a bit and put some bigger rollers in it and see. -6 Rollers |
|
I saw your post on HKPro. You will get more technical help there, obviously. Sometimes, if the barrel pin has broken, it will allow barrel to sit further away and the top of carrier will hit rear of cocking tube before bolt is forward, so essentially your bolt-face isn't bottoming out like it should. Had this happen to me with a MP5K clone that he built me. Gap was fine, shot it then gap shot way up to like .032... He had to re-do barrel and refinish.
Definitely good advice to clean it and pull rollers out and see what you have. There's a good guide to identifying rollers on HKPro. Google can help you there. Then reassemble and re-check bolt gap to confirm it is as high as you saw before. That will help you and Jeff troubleshoot. |
|
Quoted:
somebody PM'd me that I should be using a different locking piece, said it should be a #3 instead of a #8 looking at HKparts.net also shows it could be a #15? How do I know which one to use or if I have the wrong one? I believe the #15 is the correct locking piece for the 53. it's possible your locking piece is out of spec but i cant immagine it making your gap that far out of spec. Im not saying it isn't causing the gap issue, I'm saying I don't see it causing that much of an issue. Hkparts.net has the 15 locking piece for 200.00. I really wish RCM would start making more 556 hk parts. 556 hk parts tend to be rare, and stupid expensive when you do manage to find them. |
|
After taking out the cocking tube support and re-installing the bolt I got .016-.017 Gap. I shaved .020 off the bolt end of the cocking tube support (NOT an HK cocking tube installed, looks like a modified 93 tube maybe) . Now my bolt gap with the weapon assembled is .016.
BUT it's still REALLY hard to cock, Could the cocking piece do that? Thanks! (BTW I've been cross posting to HKPRO for help, Thanks to everyone) |
Armory Sponsor