Shane, if the Glenfield has a bracket between the barrel and the magazine tube, where the screws that hold the endcap on screw into, it is dovetailed and will have to be knocked out. At least that's how it looks on my version. There is also a screw in the lower front of the receiver that may be part of holding the forend on at the receiver end.
I didn't take mine apart, just looked at it to see if I could see anything after reading your post.
Cheers
Kerry