Where's a tutorial? > Build It Yourself

Posted: 12/30/2009 11:30:40 AM EDT

Where's a tutorial on recutting feed ramps to the M4 specs? I have some carbines with older Colt lightweight barrels (regular ramps in extension) that have been put on new Daniel Defense flattop uppers (that have the M4 ramp cuts) that I need to have cut. I have heard you can do it with a dremel and the proper carbide acessories, and patience. I also have a mini-mill I could use if I knew what I needed and proper procedure.

Thanks in advance!

Posted: 12/30/2009 11:38:44 AM EDT

[#1]

I just used my Dremel with a small, shaped grinding bit. The whole job took about one minute to do.

Posted: 12/30/2009 12:04:12 PM EDT

[#2]

Thanks. If it was mine I would probably do that, but I have about ten to do and if I don't do it right it may cost an officer his life. I am looking for detailed instruction.

I can use a dremel if I can't figure out how to use my mini mill to do it, but I imagine I would pull the barrel, remove a bit from the extension ramps and then install the barrel to see how close I am to a continued plane and then repeat until I get it perfect.

How do the big name gunsmiths do it? Do they put new M4 extensions on the barrels or do they cut what's there?

Any specifics are appreciated.

Posted: 12/30/2009 12:11:13 PM EDT

[#3]

Quoted:
Thanks. If it was mine I would probably do that, but I have about ten to do and if I don't do it right it may cost an officer his life. I am looking for detailed instruction.

I can use a dremel if I can't figure out how to use my mini mill to do it, but I imagine I would pull the barrel, remove a bit from the extension ramps and then install the barrel to see how close I am to a continued plane and then repeat until I get it perfect.

How do the big name gunsmiths do it? Do they put new M4 extensions on the barrels or do they cut what's there?

Any specifics are appreciated.

Sorry I can't help you with more specifics. I just had to touch mine up to get them all smoothed out.

Hopefully someone will come along with more info.

Posted: 12/30/2009 6:34:28 PM EDT

[#4]

here ya go....

Adding your own M4 cuts to your Barrel Extension (Do it yourself)

Posted: 12/31/2009 7:14:03 AM EDT

[#5]

Even ADCO uses the dremel! I will however remove the barrel instead of grinding with the barrel in the upper. I don't want to remove anodizing or bugger up the upper (would that be a buggered-upper?). I'll do a little at a time until I get the hang of it.

Thanks guys.

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[ARCHIVED THREAD] - Where's a tutorial?

[ARCHIVED THREAD] - Where's a tutorial?