AR, feed ramps or not

[dtucker]

I am not green to shooting the AR but i am as to why or how things function or their purpose to a certain degree. What is the purpose of the feed ramps and do you need them? I see at times some upper receivers will have them and not. Do people like Robert Whitly here use them on their builds. Are they their for feeding the brass to the chamber and making it easier? I hope someone here can give me the scoop on these.

 

[pdhntr]

Feed ramps are already in the barrel extension. They have to be there, or the cartridge will not feed properly.

There are two types that I know of. Older ARs will have the "rifle" type, and newer ARs, often termed the M-4 and variants will have the M-4 ramps. The M-4 ramps are also cut into the frame of the upper.

So if you change barrels you must look and see what you have and proceed accordingly.

Jim

 

[dtucker]

AAAAHHHHHH thanks for the quick response and the answer to my question. It is so very clear now. ;D

 

[pdhntr]

I have both types and can't find any difference.

In my ARs, the bullet tips are hitting the feed ramps about 2/3 of the way up the ramp. So even the rifle type of ramp is more than adequate.

The reason for the M-4 ramps is often debated.

Jim

 

[broncman]

I know an AR with properly massaged and cleaned up feed ramps leave brass in a lot better shape... I hate the marks poorly done feedramps leave on brass.