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Old 02-09-2010, 08:06 PM
GlenS GlenS is offline
Join Date: Sep 2001
Posts: 879
Milling cut for a ramped barrel?

Where can I find the proper cuts to make to fit a ramped barrel to my 1911 frame?
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Old 02-09-2010, 08:25 PM
hiloboy hiloboy is offline
Join Date: Aug 2008
Posts: 191
Instruction sheet that comes with the barrel should tell you. There are diffrent types of ramp barrels also.
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Old 02-09-2010, 08:27 PM
ken_mays ken_mays is offline
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Join Date: Aug 2003
Location: Memphis TN
Age: 47
Posts: 3,536
The barrel manufacturers include instructions.

Here's a pertinent article from Brownell's:
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Old 02-10-2010, 08:50 AM
richpetrone richpetrone is offline
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Join Date: Nov 2006
Location: Central Florida
Posts: 6,322
Milling cut for ramped barrel

The two most predominant type of ramped barrels are the Wilson/Nowlin ramped and the Clark/Para Ordin ramped barrels. The required milling cuts are different for each, so reading the mfg instructions is best.

I have all W/N ramped cuts on several of my guns. I cut one frame for a W/N ramped cut only using a drill press, files, and hand tools since I don't have a mill. It took a lot of time, but it came out fine, and I use the gun for self defense. In my opinion, the critical element is to make sure the ramped barrel hits the bottom of the ramp cut and the top sides of the bridge of the frame at the same time, which dissipates the unlocking force over a broader area. Also, I like to make sure the bottom of the feed ramp is slightly into the mag area inside the frame when it is completely in the ramp down position. This brings the feedramp as close as possisble to the magazine and helps to prevent nosediving when bullets feed. I may cut back the bottom of the feedback a few thousandths so the mag won't bounce against the very bottom of the ramp. None of the magazines I have ever used feed the cartridges so they strike at the very bottom of the ramp, but more midway on the feedramp. My guns feed very reliably with all bullet nose styles, including JHP's.

Last edited by richpetrone; 02-10-2010 at 08:53 AM.
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Old 02-10-2010, 10:02 AM
donw donw is offline
Join Date: Dec 2000
Location: chino valley, az
Posts: 1,456
Glen, Although the basics are the same for the two different type of ramp cuts, I would strongly recommend you use that brand of barrel makers instructions for doing any cutting, as even with the same type of ramp (take Wilson/Nowlin for instance), some of their measurements do vary slightly, such as one maker telling you to cut down x thousandths from the top of the frame rails, while another maker may give you another measurement. Typically it's not a bunch, but could make a difference in the overall install. Best,
Don Williams
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Old 02-10-2010, 10:37 AM
Aircooled6racer Aircooled6racer is offline
Join Date: Jun 2006
Location: Alpharetta GA between the ponds
Posts: 1,619
Hello: If you have not bought the barrel yet get a Clark/Para ramp cut. It is one setup in the milling machine. Also if you have not bought the barrel yet look at the Briley barrels at He has great prices on them. Hope this helps. Thanks, Eric
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