uppers and lowers

[Expendable Nate]

Alright this might be a stupid question and I’m in the army and a good shot but I have no interest or an overabundance of knowledge of AR's alright my questions

1. AN AR lower do they all have the same sized magwell?
2. If they do how do the rounds sit in the mags?
Ex. . .223 compared to 308


Again possibly dumb question but I’m inquiring for a friend thank you all for reading



Hope your mags never run dry

 

[Grizzlypeg]

diifferent receivers

 

[.223Rem]

.223 AR's are ar-15's and .308 AR's are called ar-10's.
I don't know all the details but the .308 (ar-10) lower has a bigger mag well because the .308 mags are bigger then the .223 mags.

 

[Expendable Nate]

gotcha thanks i didnt know if maybe the rounds just would sit different in the mags or something thanks

 

[hbean]

5.56x45 VS 7.62x51 The second number general denotes the length of the cartridge case, add the length difference between the two bullets, you can easily estimate the size difference between the riounds.

 

[shatthatkilledelvis]

I may be wrong, but i believe there are also 2 different types of mags/magwell patterns for .308 cal AR-10 - to complicate the matter...

 

[5440fight]

The Ar10 is an Ar15 on steroids. Everything is bigger but the grips and stock.

Bcg:

top view:

 

[Expendable Nate]

thanks to those with something useful to say