There has been a debate in the past, was this rifle stocked by J. Graeff, or was this rifle stocked in Mecklenburg County by Isaac Price using a Graeff signed barrel. There are no signed Isaac Price rifles known to survive to compare it to. The triggers in this J. Graeff rifle are identical to the triggers in the only known signed rifle by Zenas Alexander. Zenas apprenticed with Isaac Price in 1787.
There is another Mecklenburg School rifle with a signed patchbox lid by "SMB" Samuel Black, that has a J. Graeff signed barrel. It is believe that the Mecklenburg School did not have its own barrel mill and reused barrels from other makers.
Michael