Yes, but you will need an adapter for the large hold LMT upper to fit on the small hole Colt lower.
@ 40 inches.
100-1000 depending on specifics
By it's serial number. Go to www.proofhouse.com and under 'long rifles' listing look for AR15 Sporter
Proofhouse.com has Colt sn data. If not there, call Colt and they will tell you.
No, but American Firearms and Tromix have made upper receiver for AR15 rifles and carbines chambered in .50 Action Express.
Only if there was one made for an AR-15 upper, which there isn't.
Depends on markings on upper.
Probably Lewis Machine Tool. Most AR-15 manufacturers don't actually manufacture their own parts - they outsource them. LMT manufactures the receivers for Colt, Noveske, and others. Continental Machine Tool is another one a lot of firearms manufacturers outsource to.
Yes, although, personally, I'd think it a waste to replace an upper just for one with a forward assist.
I just purchased one from a dealer in like new condition for $1,000. I believe that to be the low end of the value of this gun. Most in this condition will be higher.
7.62x25 is the Tokarev pistol cartridge. No manufacturer currently makes an upper for that cartridge.
yes