Problem with AR feed ramps...please help

[kcstott]

Umm I don't know what you're getting at but I see a set of feed ramps in the pictures he posted.

The M4 feed ramps are located on the barrel extension and extend into the upper.

[ar15barrels]

I don't mean to nitpick, but your original post said you thought you had problems with the feed ramp, and you STONED the feed ramp, but your pictures are of the locking lugs, and neither one shows the feed ramp.

The picture he posted clearly shows the feedramps, both in the upper receiver AND in the barrel extension.
Are you are looking at the picture on your phone?

[Cobrafreak]

Mine was doing the same thing as yours. This is how I fixed it. The feed ramps need to begin at the bottom of the aluminum of your lower and flow as one into the steel portion of the ramps. The angle was too steep causing the bullet tip to slam above the chamber before it entered the chamber. Ideally you want the bullet ramp aiming the bullet so the tip goes directly into the chamber. There are lots of examples of proper m4 feed ramps on the web. Print out what you want to accomplish and use a dremel and slowly grind and polish till you achieve perfect feeding 100% of the time.

[Touchdown456]

Thanks for all the info everyone. I may have started this whole thing for no reason. The marks I saw on the Bullet (pic below) may be completely normal, but for some reason I thought they may affect accuracy. Am I wrong to think that a bullet should enter the chamber as clean as possible? Otherwise might little grooves (aside from rifling marks) effect its spin?



I can post a real picture tonight

[ar15barrels]

Thanks for all the info everyone. I may have started this whole thing for no reason. The marks I saw on the Bullet (pic below) may be completely normal, but for some reason I thought they may affect accuracy. Am I wrong to think that a bullet should enter the chamber as clean as possible? Otherwise might little grooves (aside from rifling marks) effect its spin?



I can post a real picture tonight

The marks are completely normal, but not desireable.
It woud be better if you did not damage the bullet on the way to the chamber, but that is just a fact-of-life with an autoloader.

Bolt guns treat the bullet better.

[Cobrafreak]

AK rifles have a much better trajectory of the 76.2x39 round entering the chamber. This can happen with the AR but you need to fix the feed ramps to do this. If it will load a round very slow via bolt into the chamber it will also do it at full speed.

[kcstott]

Thanks for all the info everyone. I may have started this whole thing for no reason. The marks I saw on the Bullet (pic below) may be completely normal, but for some reason I thought they may affect accuracy. Am I wrong to think that a bullet should enter the chamber as clean as possible? Otherwise might little grooves (aside from rifling marks) effect its spin?



I can post a real picture tonight

Any mark on the bullet will affect accuracy. But by how much?? How much was you? How much was the inherent inaccuracy of the rifle? Of the load?? Wind, Temp shifts, How accurate is accurate??

You have a semi auto weapon, under no circumstances will it be a precision rifle. Not to say that they can not be improved in accuracy or already are not pretty damn accurate. It's just they will never be bolt rifle accurate.

You are over thinking it.

[ar15barrels]

You are over thinking it.

Over-thinking is the plague of under-doers.