View Full Version : Feed-ramps
midSCarolina
05-04-13, 23:05
Do these feed-ramps look ok or should I be concerned about their function? Appreciate it
http://i1115.photobucket.com/albums/k558/thornejc23/photo-28_zpsb116b570.jpg
http://i1115.photobucket.com/albums/k558/thornejc23/photo-27_zpsf72cef7b.jpg
Those look good. Is this your first rifle with M4 feed ramps?
They probably will work fine, but they definitely aren't done/aligned well. I'm not bothered by much, but I'd be bothered by them.
What brand of upper is that? The M4 cuts in the upper are too close to each other from what I can tell.
There is a good smooth transition from the upper ramps to the barrel ramps.
I hate how my phone can never display pictures well. I would look for a new upper and give the company who made this an earful.
You mean what brand of upper?
I must be missing something, but I am on my mobile. They look fine on a 4 inch screen.
(ED: AND FREAKING TERRIBLE ON A LAPTOP)
Yep, upper. Just thinking about two things and typing about another.
I don't know about you guys but that doesn't look fine to me. On the first pic you can clearly see that in the center of the barrel ext ramps they overlap against the ramps on the reciever wich to my understanding can cause feeding issues.
I would contact the company who built the pictured upper. The thing is simply unacceptable, no matter who made it. I would not trust that as a range toy.
I don't know about you guys but that doesn't look fine to me. On the first pic you can clearly see that in the center of the barrel ext ramps they overlap against the ramps on the reciever wich to my understanding can cause feeding issues.
Noticed that when I got the pic up on a bigger screen. That looks like a rifle extension on an M4 upper.
midSCarolina
05-04-13, 23:48
Yep, upper. Just thinking about two things and typing about another.
It is an LMT upper (all LMT BCG ect ect) bought as a complete upper then the bolt (LMT) was bought separately. All parts were bought new. I have owned several LMTs prior to this and they looked better but unless something is really wrong looking I am not going to complain typically. I need to go shoot more bc i am concerned that I somehow loaded empty casings into the magazine bc I had put empty brass into the ammo can with the unfired rounds. This would be really really dumb and I don't see how it could have happened but I honestly hope that is what I did because I got a couple of malfunctions today that kinda baffled me.
Here are pics of the malfunction. It was a failure to eject so i don't even see how feed-ramps would be involved but I'm not 100% sure. In the first pic see if you can tell if the casing is still partially in the magazine.
http://i1115.photobucket.com/albums/k558/thornejc23/Malfunction1_zpsc4e92cd2.jpg
http://i1115.photobucket.com/albums/k558/thornejc23/Malfunction2_zpsb5470c3c.jpg
I then went through some of my old brass from previous trips and noticed that a lot had this flat spot:
http://i1115.photobucket.com/albums/k558/thornejc23/photo-31_zps222248f3.jpg
That is not a rifle extension. http://img156.imageshack.us/img156/407/m4cuts0xk.jpg
While cruising M4C tonight I am also cleaning some rifles. Turns out my daughter's 6.8 SPC with Noveske upper and ARP barrel looks just like that one above. It works fine. It's never had a feed issue, but my 5.56 defense guns.. a BCM and DD both have perfectly aligned and smooth ramps.
The flat spots on the mouths of the cases is from ejection. They are spinning around and hitting the brass deflector. In fact, there are brass marks on the back of the ejection port that looks like brass is hitting there too. Now you have more stuff to stress out about :D
ETA- AR's will not feed empties. They look just like what you have. Nothing to do with feed ramps at all. You are lucky that even got out of the mag instead of just smashing into the front of the mag.
midSCarolina
05-05-13, 00:00
The flat spots on the mouths of the cases is from ejection. They are spinning around and hitting the brass deflector. In fact, there are brass marks on the back of the ejection port that looks like brass is hitting there too. Now you have more stuff to stress out about :D
Haha awesome... you know what may cause it to do that? Over-gassed? It is a 14.5 carbine length w/ standard buffer. This one VV seems to do the same thing but 2 other vids like this did not have it flip around like that.
http://www.youtube.com/watch?v=xPwTGfhUulk
And do you think it is worth giving LMT a call? I don't want to be an asshole but I don't wan't a rifle that sucks.
I don't get too wound up in the whole "clocking" of ejected rounds. I have a couple guns that don't dent brass at all, and one the dents the shoulders. None of mine get to the mouth like yours, but I've seen it in guns that run really well. I don't have the experience to tell you if it's cycling fast or slow.
There is no way the feed ramps are doing the denting. I think your gun is fine. I do have to compliment you on using plenty of lube.
Some of you need to relax. There is nothing wrong with those feedramps other than the fact that it is not very visually stimulating. Unless you are having malfunctions don't worry about it.
midSCarolina
05-05-13, 09:32
I just put 200 rounds through it in fairly rapid succession and it was 100%. I really think that the failures were a result of my own carelessness with the empty brass.
I did purposely load an empty casing into it at the house and used the bolt release to simulate what would have happened and this is what I got:
Simulated Malfunction
http://i1115.photobucket.com/albums/k558/thornejc23/photo-33_zpsfc02d0b9.jpg
Actual Malfunction
http://i1115.photobucket.com/albums/k558/thornejc23/Malfunction2_zpsb5470c3c.jpg
Simulated Malfunction
http://i1115.photobucket.com/albums/k558/thornejc23/photo-32_zpsa18e7b86.jpg
Actual Malfunction
http://i1115.photobucket.com/albums/k558/thornejc23/Malfunction1_zpsc4e92cd2.jpg
These looked pretty identical to me but let me know if there are any other opinions here. I really appreciate all of the help so far.
Shoot it :D Plenty of rifles out there with perfect feed ramps that don't function because people can't stop ****ing with them. A rifle upper with no M4 cutouts and a carbine barrel extension will feed just fine. As long as no part of the barrel extension feed ramps overhang the upper feed ramps (or lack of feed ramps) you will be just fine. Not perfect looking, but it's going to run and that is what matters.
ETA.. I probably shouldn't have made my first comments in this thread. I blame tired eyes last night as I swear those photos showed the barrel ramps overhanging the upper ramps. This morning it looks totally different to me.
sinlessorrow
05-05-13, 17:42
They don't look great but they will work. I will say my BCM uppers look absolutely perfect.
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