AR-15 question
 

How well do uppers and lowers from different manufactureres match up? I have a Bushy and I'm looking for an upper and there are a few out there that I like but they're from different manufacturers. Help?

I believe they are almost all interchangable. There are some colt differences because of the Pin hinge verses and nut and bolt setup. I believe they are all Mil-pec firearms. A quick line to the upper manufatcor would solve any question and most respond quick.

I just ordered a Bushy Varment special. I will be looking for a few upgrades As i think I am going to really like the setup.

uppers
 

If they are mill spec, and the same size pins, there were at least 2 differnt sizes made but can be used with an offset pin kit, they should all interchange except a few of the colts which mere made not to fit a standard lower.
The only company who comepletely manufactures they're AR's is Olympic Arms, all the rest buy parts and put them togather. Just decide how good of barrel you want and look into whats available.
J&T will sell you a complete upper, less barrel then you can get a custom barrel in say a 204 ruger, stick barrel on and you have a LR, HV varmint rig.
The possibilities are endless, anything that will fit down the magwell can be had
I have a 458 SOCOM, and a 25 WSSM chambered in the AR's, they are awesome hunting rigs.
RR

Tater
 

I have a Bushmaster and purchased a Colt upper and it works fine. My Bushmaster is scoped so I bought the Colt upper for open sights.
muledeer

Colt uses the large front pin and the rest use the smaller pins.


http://www.fulton-armory.com/Combini...rs.pdf#search='colt%20upper%20pin%20size'


Colt will work, but you'll need to get a new pin, otherwise it will fit right up.