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Posted: 11/2/2010 4:06:49 AM EDT
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Tomorrow I gonna buy this 7' barrel
http://www.midwayusa.com/viewproduct/?productnumber=316751 I have a question with : Technical Information: * Mil-spec certified 4150 chrome-moly vanadium steel barrel * True 5.56x45 NATO chamber * M4 feed ramps/Barrel Extension <––––––- This barrel is only compatible with a upper with M4 Feedramps or can I buy an standar upper. Which of those two upper I need to buy ??? http://www.bravocompanyusa.com/Upper-Receiver-assembly-M4-Flat-Top-p/flat%20top%20-upper%20-m4%202.htm http://www.bravocompanyusa.com/Upper-Receiver-Assembly-Flat-Top-p/flat%20top%20upper1.htm |
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Either. M4 feed ramps are in the barrel extension you are using. The M4 reciever you have listed has machined ~blend areas to transition to these ramps. They may line up with the barrel, or they may need a dremel touchup. Ramps aren't always ramps.
The other reciever listed is the same other than that tranistion area. It's not much work to do yourself either way, but I would get the M4 style first to see how they mate. |
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This is what I used with a Rainier Ultra Match 7.5" with M4 feed ramps.
http://www.bravocompanyusa.com/Upper-Receiver-assembly-M4-Flat-Top-p/flat%20top%20-upper%20-m4%202.htm |
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