Being a QD type mount, is it normal for the mount to take chunks of the rail out every time you attach and/or remove it? This isn’t merely a “mark” in the finish of the rail. It is all the way down to the bare metal. Over time, will this eat more and more of the rail away? Hard to see in the photo, but the length of the damage goes to about half-way down the height of the lugs. And can naked aluminum rust? The reason it’s doing this is the mount’s recoil lug has a rather large “bump” in it (by design) that indexes against the rail’s lug. It’s supposed to compress I guess. But in doing so, it’s gauging up the rail. I know “it’s a gun,” a tool, and not something that’s going to remain pristine. But this is actual damage. It’s not cosmetic.
One of my Bobros has left a circular mark on the horizontal surface of the slot. Not a concern so I don’t think about it.
Aluminum oxides, but does not rust. This is a surface condition only and should not be something to worry about. Aluminum oxide is quite hard (harder than pure aluminum) and forms rapidly after exposure to oxygen.
Having been down this road with other mounts more than once, I am going to guess what will happen: the mount maker will blame the rail for being out of spec, the rail maker will blame the mount for being defective. You can’t fault them for that, it’s just each maker will not want to instantly take the blame for the situation. This may lead each to ask you to send them the whole assembly for examination.
First thing is to check the Bobro against another piece of rail from a good manufacturer (preferably aluminum). If you can (or can not) replicate the mark on another in spec rail section, then you may have the answer.
I checked the mount on a separate piece of Noveske Keymod and it didn’t cause any damage or marks. The piece of keymod rail I have has a different coating. The rifle is anodized and cerakoted according to the specs listed on Noveske’s website. And the keymod I tried the mount on is much darker and slightly textured.
I contacted Bobro, but they didn’t really say much in response, just that “The index is designed to contact the rail, and it shoves itself forward in the slot. There is contact.” Reading between the lines, I think they’re saying to forget about it. But this isn’t cosmetic. It’s actually digging into the metal of the rail. and since the rail and receiver are one piece, it could be a problem if I continue to use this mount. I specifically bought a Bobro mount to avoid the issue of Larue mounts digging into the side of the rail, only to find that the Bobro is digging into the top of the rail. Lose lose for me.
So I guess I need to contact Noveske now. But I don’t know what they’re going to do. Other than me asking for a refinish or a new upper receiver, which I doubt will happen. I just bought this rifle about 3 weeks ago. ugh.
Am I the only one here that wants to use the “T” word?? You ask a valid question George but this guy isn’t willing to accept any answer he doesn’t want to hear.
I was moving the mount around on the rail to find the best position for my scope. I can’t foresee how much I will be removing the mount in the future. However this is a QD mount and it was designed to be removable…
There is no burr on the recoil lug. If anybody has seen a Bobro mount, you will find that the recoil lug has a bump or protrusion that forces it against the rail. This bump is what is causing the damage. I am not blaming Bobro though. I was just wondering if this was a common thing. Maybe the finish in my gun is super soft. Or maybe the rail is “out of spec.” I don’t know either way. I certainly haven’t seen this happen with anybody else though.
Do you have the scope that you are adjusting the positioning for yet? I didn’t think so. Yes… QD mounts are designed to be removed quickly when necessary. They are not designed to be removed 8 times a day 7 days a week. Please listen and learn.
Yes, I already have the scope. It arrived two weeks ago.
Please listen and learn? Who the hell do you think you are? You haven’t offered a single bit of helpful information at all in this or any other thread of mine. So who exactly am I supposed to listen and learn from? You? Right, fat chance. And this is now the FOURTH time you’ve come into a thread of mine and started acting like a fool. To anybody reading this, this guy has some weird fetish obsession with me. He comes into every thread of mine and intentionally tries to derail it.
For the FOURTH time, please go away. Stop trolling my threads.
My company, Kinetic Ops, has dealt with Andrew Bobro for four years and he’s a standup guy. I’d send it back to have him look it over - if there’s a problem he’ll fix it. If he says it’s good to go then I’d trust him.
“The only thing new is the history you don’t know”.
