So I have this old AR.

[Renegade04]

Don't know what the benefits of a pre-94 are but I don't think this is one of them. Bought it new in 99.
Please elaborate on what makes a pre-94 desirable.

Pre-1994 ARs were made before the Public Safety and Recreational Firearms Use Protection Act, commonly called the federal Assault Weapons Ban (AWB
and AWB 1994), was enacted in September 1994. Pre-ban ARs command higher prices in states where on pre-ban ARs are allowed to be owned. In other states where citizens have real freedom, pre-ban ARs have no bearing and do not command high values. In states where there are no pre-ban restrictions, you can find pre-ban Bushmasters for $600 and less. The same for Pre-ban DPMSs, Olympic Arms, and a couple others (excluding Colts as they maintain a strong market value due to their collectability status).

[Esq.]

The serial number cut off for pre ban serial numbers with Bushmaster is 51,000.

[Dukr]

The serial number cut off for pre ban serial numbers with Bushmaster is 51,000.

Is 51,000 a for sure number? I have a pre-ban Bushmaster lower I bought in 1994 that is in the 62,000 range.

[The_War_Wagon]

How much do the old Colt SP1s and preban Bushmaster type guns sell for in those barn states?

I sort of follow PWA lowers (morbid curiosity!), because I actually owned one of their pos HBars in the early '90's. I saw a stripped PWA lower go for $500 in NYS a couple of years ago!

[Esq.]

Is 51,000 a for sure number? I have a pre-ban Bushmaster lower I bought in 1994 that is in the 62,000 range.

Below is definitely pre ban. From there to 63000 it's a crap shoot, you have to call Bushmaster to know for certain.