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Posted: 3/31/2010 8:09:20 PM EDT
| Quick question. Im about to purchase a new upper and wanted to get one that has the m4 feed ramps. Will these align correctly with the ones on my barrel or are there different sizes or does it vary by company? |
| Generally they are one size. Any variance will just be between the upper brand and the barrel extension. In other words there are not different sizes. If your barrel has an M4 extension an M4 ramped upper will fit. If it doesn't you want to buy a non M4 ramped upper. |
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The two ramps are cut deeper. You should be able to see their cuts if looking at the extension from the side.
If your old upper had two little ramps then there is a good chance the barrel has an M4 extension. If it didn't have the ramps then it's likely the barrel doesn't have an M4 extension. Here is a picture to help out: 
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I'm sure it can be done. Personally I wouldn't worry about it, but your choice. Check with ADCO or wait until somebody else comes along with a response.
Look at your old upper. If you don't have brass marks on the upper just below the ramps from bullet tips hitting it then chances are you never needed M4 ramps. |
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