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Posted: 12/7/2011 8:45:42 AM EDT
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I am about to have a build party for me and some Friends
Can comeone explain the M4 Ramp to me I have 3 recievers on order from MMS ,does it matter if my uppers on order have M4 ramps or not? What if anything do the Ramps have to do with the lower? Hank |
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The barrel extension is what really matters.
On the M4 ramps, there is a larger area to help feed the bullet tip. This also matches the ramp cut into the upper receiver, directly bellow and in line with the barrel extension feed ramps. If your barrel has M4 feed ramps, it can run with a standard receiver (that lacks the cuts) as well as the upper receiver that does have the cuts. On rifle type barrel extensions, the feed ramp area is not as pronounced. The upper receiver is not cut for ramps. If you fit a M4 cut receiver with a rifle barrel extension, it can cause misfeeding....the bullet tip follows the M4 cut in the receiver and gets caught against the rifle barrel extension. Not good. Match the barrel extension to the upper receiver and it all works out. Someone will be along shortly to post the picture showing the different ramp/barrel set-ups. Found it. 
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