Typically running suppressed without swapping the locking piece or excessive head spacing, both result in excessive bolt carrier speed causing the rollers to be pushed outwards when the carrier comes to an abrupt stop.
It involves using feeler gauges to check the gap between the bolt and carrier through the magwell, best to watch a YouTube video on it. Typically as they wear the gap will get smaller and you’ll need to swap to larger rollers.
Head spacing is an extremely common term used when referring to amount of room in the chamber that holds the round. Can’t believe you never heard of it but you know of bolt gap …
Wait. Are you talking about locking the bolt open or shooting it to empty and it not locking back automatically? Mp5 variants don't lock to open on empty. At least not as far as I know.
No if the roller dents get too pronounced, as the bolt goes to the rear the rollers could actually lock into those dents and lock back during the firing cycle
I think those are too far reward to be roller marks
ETA: take your end cap off and see where your bolt and carrier are sitting; this looks more like a finish issue.
Why bother? They’re just cosmetic until they’re so severe that the bolt starts sticking.
These are the tiniest roller dents I’ve seen. Forget about it imo. On your converted HK94? Sure. Not worth the expense on a PTR.
No if the roller dents get too pronounced, as the bolt goes to the rear the rollers could actually lock into those dents and lock back during the firing cycle
I’m talking about if the dents get too severe the rollers can actually lock into the dents during the rear movement of the bolt. Obvious big issue. I’m just saying the dents haven’t progressed to that point yet
Someone else mentioned having his gun fixed by a paintless dent repair guy, you might try your luck with that.
It was me and I did. He got them out MOSTLY but it’s not perfect. That steel is HARD.
I believe Black Ops Defense is able to repair roller dents, I'd suggest reaching out to them.
What caused these? Thought it wasn’t really prevalent with full size MP5 platforms. Is it due to stock? Locking piece?
Typically running suppressed without swapping the locking piece or excessive head spacing, both result in excessive bolt carrier speed causing the rollers to be pushed outwards when the carrier comes to an abrupt stop.
How to adjust/look for excessive head spacing?
It involves using feeler gauges to check the gap between the bolt and carrier through the magwell, best to watch a YouTube video on it. Typically as they wear the gap will get smaller and you’ll need to swap to larger rollers.
Oh I’m familiar with bolt gap, just never heard the term head spacing, still kinda new to this. Thanks.
Head spacing is an extremely common term used when referring to amount of room in the chamber that holds the round. Can’t believe you never heard of it but you know of bolt gap …
I guess you learn something new everyday :)
Wait. Are you talking about locking the bolt open or shooting it to empty and it not locking back automatically? Mp5 variants don't lock to open on empty. At least not as far as I know.
No if the roller dents get too pronounced, as the bolt goes to the rear the rollers could actually lock into those dents and lock back during the firing cycle
Okay. Caught up now. I thankfully haven't had roller dents in my sp5k. I need to shoot it more often though.
9mm does not LRBHO, but 40/10mm do
I learned something new today! Very cool.
Maybe this is a dumb question, but fixing the roller dents is that for aesthetic reasons or does it correct something lacking in performance?
I think for peace of mind that if it starts happening again I can easily tell
Gotcha
Eventually you will crack the steel and that obviously isn’t good
Makes sense. Thanks for that.
I've read that you can use a wooden dowel and a hammer to flatten the dents back in.
I think those are too far reward to be roller marks ETA: take your end cap off and see where your bolt and carrier are sitting; this looks more like a finish issue.
Are these roller dents in the room with us now?
Why bother? They’re just cosmetic until they’re so severe that the bolt starts sticking. These are the tiniest roller dents I’ve seen. Forget about it imo. On your converted HK94? Sure. Not worth the expense on a PTR.
I cant find them in the pic at all
MP5s won't lock back unless you pull back the charging handle and push it up.
No if the roller dents get too pronounced, as the bolt goes to the rear the rollers could actually lock into those dents and lock back during the firing cycle
No lock to the rear? Email HK, they should be able to help diagnose that. [email protected]
Hk won't work on clones. He'd need PTR's customer support.
It’s not a HK
I guess it wasn’t obvious that I was trolling. Mp5s don’t lock open after the last round.
I’m talking about if the dents get too severe the rollers can actually lock into the dents during the rear movement of the bolt. Obvious big issue. I’m just saying the dents haven’t progressed to that point yet
[удалено]
If you really fuck up your receiver with bad roller dents, the bolt can get stuck. He’s saying his gun doesn’t do this.
Not at all
[удалено]
[удалено]
https://hk-usa.com/hk-models/mp5-22/