9mm upper change

[smith m4]

I am considering buying a 9mm upper for my S&W M&P15 in 5.56.

Whose upper should I buy? I am currently looking @ Rock River.

Can I just pop the 5.56 upper off and pop the 9mm upper on or do I have to change a bunch of other things?

I do know I will have to get 9mm mags can someone tell me what kind to get and where to find them.

Any other advice on this subject please feel free to add.

[BOBK48]

Along with the upper you'll need a mag block(it holds the magazines in place in the magwell), a 9mm hammer and buffer change. You can get the bolt ramped then you wouldn't need to change the hammer.

If your going with Rock River check their web site they have the other things you'll need. There are other manufacturers who make parts, kits or guns. There is another site that has a pistol caliber AR forum with an FAQ that might be helpful to you.

[Mooneys]

BOBK48 is correct, the hammer, buffer will need to be changed as well as a mag block to accomodate the 9MM mags...use colt mags. C Products is coming out with their version, similar to colt but half the price.

If you're thinking about frequently switching from 5.56 to 9MM you may consider getting a seperate rifle. IMO

RRA 9MM Complete Uppers will work fine. It's a matter of preference.

If you have questions give us a call.



I am considering buying a 9mm upper for my S&W M&P15 in 5.56.

Whose upper should I buy? I am currently looking @ Rock River.

Can I just pop the 5.56 upper off and pop the 9mm upper on or do I have to change a bunch of other things?

I do know I will have to get 9mm mags can someone tell me what kind to get and where to find them.

Any other advice on this subject please feel free to add.