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Those are M4 profile barrels, and the notch is to accommodate the mounting bracket for the M203 grenade launcher.

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Q: Why do some AR-15's have a notch on the barrel?
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What as the average soldiers rifle?

A lot of soldiers use AR15s these days. Some still use the M16. This is a very generalized answer,but I hope it is useful.


How do you disasemble 25 cal liberty arms pistol?

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Go to Remington.com and download an owner's manual. most modern choke tubes have some type of marking that will allow you to determine the choke without removing it from the barrel. some use a notch system while others have stars.


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What are some unique feture to huntingtons disease?

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Did notch die?

No notch is still alive