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jlehr
04-20-2012, 3:24 PM
So i have a jfk upper reciever I'm matching with a woa 18spr and the feed.ramps on the upper are really small compared to my bushmaster upper reciever will this affect anything? I'll post some pictures later

MXRider
04-20-2012, 3:26 PM
Hopefully this will help answer your question. Some uppers have pretty shallow M4 extensions, but they should be fine.

http://www.ar15armory.com/forums/uploads/1315930128/gallery_18313_138_71257.jpg

Saym14
04-20-2012, 3:31 PM
Hopefully this will help answer your question. Some uppers have pretty shallow M4 extensions, but they should be fine.

http://www.ar15armory.com/forums/uploads/1315930128/gallery_18313_138_71257.jpg

should not the pic in the upper right be labeled BETTER ?

707electrician
04-20-2012, 3:33 PM
should not the pic in the upper right be labeled BETTER ?

Why is it better?

InkHammer
04-20-2012, 4:24 PM
As the ramp and extension complement each other, the bullet tip is most likely to enter the chamber correctly every time.

Droppin Deuces
04-20-2012, 4:45 PM
I could be wrong, but I don't think you(Read: anyone) can pull the trigger fast enough for M4 ramps to be of much use on a semi auto rifle.

Sturnovik
04-20-2012, 4:55 PM
I always wondered if they made a big difference for us semi auto users.

1859sharps
04-20-2012, 5:42 PM
I always wondered if they made a big difference for us semi auto users.

Falls into the nothing to lose, might help category.

707electrician
04-20-2012, 5:45 PM
I always wondered if they made a big difference for us semi auto users.

They don't. I don't think anyone has heard of a fail to feed in a semi auto AR because of rifle feed ramps

MrPlink
04-20-2012, 5:55 PM
there is actually a lot of debate as to whether the M4 style feed ramps even matter for FA.
Some have charged that is something Colt simply made up.

Sturnovik
04-20-2012, 6:07 PM
Well don't get me wrong. I come from a pistol/shotgun background, but I would think it couldn't hurt to have them. But yea I wonder if they ever made a big difference.

jlehr
04-20-2012, 10:45 PM
http://i1154.photobucket.com/albums/p530/jlehr25/IMAG0309.jpg
http://i1154.photobucket.com/albums/p530/jlehr25/IMAG0312.jpg

so heres the pictures of my bushmaster uppers feedramps

http://i1154.photobucket.com/albums/p530/jlehr25/IMAG0310.jpg
http://i1154.photobucket.com/albums/p530/jlehr25/IMAG0311.jpg

will those feed ramps affect anything or am i just being obsessive on this??

Droppin Deuces
04-20-2012, 11:03 PM
You should see the feed ramps on my upper. Oh wait, there aren't any.

You'll be fine.

1859sharps
04-21-2012, 12:41 PM
there is actually a lot of debate as to whether the M4 style feed ramps even matter for FA.
Some have charged that is something Colt simply made up.

I am old enough to remember the days before the M4 feed ramps, even on guns using carbine length gas systems. I have one one myself. works flawlessly so far.

As long as your not paying more for it, and your upper or rifle comes with them. Bonus. they aren't going to make your rifle less reliable.

If you have an otherwise quality built rifle and it doesn't have them. I have yet to hear a good and convincing argument for running out and "fixing" your gun to have M4 ramps.

They are absolutely not required for full rifle length gas systems.

FeuerFrei
04-21-2012, 3:00 PM
higher bolt speeds, full auto on real M4 rifles with heavy extractor springs and O rings + h buffers were a result of chopping down a M16 rifle. brute force way to tame the beast. it works.
m4 cuts were to adress the higher bolt speed combined with full auto and lazy worn mags with crappy followers causing rounds to nose dive.
if you tune your carbine to function more like a rifle you will see no need to add the other stuff on there.
i have experimented with this M4 cuts or no cuts on my own rifles and carbines and found that if your gas system and action spring/buffer are properly tuned it will feed and fire reliably.
the only complaint i have about the ar15 is that stoner never designed an adjustable gas block for it.
you dont need it if you only fire what the military gives you. we civies shoot all kinds of different ammo for many different reasons and there's the rub.
carry on.

MXRider
04-21-2012, 3:05 PM
OP, your rifle should be fine. Curious though, is that a current production Bushmaster upper? Or was it an older piece you had laying around?

707electrician
04-21-2012, 3:39 PM
http://i1154.photobucket.com/albums/p530/jlehr25/IMAG0309.jpg
http://i1154.photobucket.com/albums/p530/jlehr25/IMAG0312.jpg

so heres the pictures of my bushmaster uppers feedramps

http://i1154.photobucket.com/albums/p530/jlehr25/IMAG0310.jpg
http://i1154.photobucket.com/albums/p530/jlehr25/IMAG0311.jpg

will those feed ramps affect anything or am i just being obsessive on this??

Like some have said, they won't hurt, they just aren't necessary

TNP'R
04-21-2012, 4:58 PM
Mine.
http://i42.tinypic.com/2128o7.jpg
http://i43.tinypic.com/33z8dqf.jpg

artoaster
04-21-2012, 5:09 PM
I have a carbine without M4 feed ramps that works perfectly, no surprise there, and I think having them maybe makes them more desirable to buyers and doesn't
help semi-auto fire but then won't hurt function in semi anyway.

Droppin Deuces
04-21-2012, 5:24 PM
Mine.

Looks like your gun's ramps haven't fully developed yet.

TNP'R
04-21-2012, 5:27 PM
Looks like your gun's ramps haven't fully developed yet.

Lol what.