upper/lower compatibility by brand

[pokey]

 The title pretty much says it.   What brands of upper and lower receiver interchange with each other? 

[Toolndie7]

Are you concerned at all with fit and looks?  or just funtion?  Lots will fit but they look awful and dont flow together at all.

[survivalshop]

  The AR 15 family , ( as far as forged receivers , not sure how Billet receivers fair )  they are all MilSpec. & have a excellent chance of matching up functionally . I would not interchange  308 AR Manufacturers uppers & lowers & its not just an Armilite ,DPMS thing , I have seen that tolerance stacking can interfere with proper function , when using different manufactures for the Receivers, just my experience. Too many fix's tweaks or things just not working , when they do in other rifles with matching components.

 

   I even do the same with my AR 15 builds now , I stay with the same manufacturer Upper & Lower Receivers.   <dontknow>

[BLKSHEEP]

Here's an old list, hope it helps.

[TheRenegadeMarine]

Here's an old list, hope it helps.

 

I noticed ONE inaccuracy on your list. The Sig 716 WILL take SR25 magazines, and not AR10

[edgecrusher]

Good catch, if I remember correctly that list pre dates the sig rifles public availability, but good catch nonetheless

[washguy]

Are you concerned at all with fit and looks?  or just funtion?  Lots will fit but they look awful and dont flow together at all.

exactly.....try and stay with same mfg :) Wash

[Toolndie7]

Are you concerned at all with fit and looks?  or just funtion?  Lots will fit but they look awful and dont flow together at all.

After saying that. I have a DPMS upper on a Tactical Machining lower and if looks and fits fine.

[survivalshop]

After saying that. I have a DPMS upper on a Tactical Machining lower and if looks and fits fine.

I have the reverse & they fit & look just fine .