[Soldatlamour]

Two weeks ago I picked up my first black rifle, a S&W MP15, in 5.56. I added an Eotech scope and have been to the range once. ^_^ That was a lot of fun.

Unfortunately, it did happen. I contracted the disease, and now I have the fever to get another AR. I want another caliber with some more "punch."

Here's my question: I was browsing through some sites and read a post that implied I could get a second upper in a different caliber (eg, 6.5 Grendel) and I'll be able to slap that on my lower (even though it's stamped "5.56").

Is that true ?

If it is, are there limits to what caliber of upper I can get to mate with my 5.56 lower?

As always, thanks for all your advices.