I remember these rifles. The barrels were non-chrome lined, 1-9" twist. The front sight bases were also cast, and not forged...if I remember correctly. If assembled at the factory as a complete weapon, they functioned fairly well. If you bought seperate components, the build quality could be very inconsistent.
I have two weapons that I built on pre-Armalite Eagle Arms upper and lower receivers. One is an early M4gery with full carry handle A-2 upper, and the other is an H-BAR. I remember a little difficulty with the fit between the upper and lower on the H-Bar, but not the M4gery. The pivot pin alignment holes were slightly off and after trying numerous manuf. pivot pins, I resorted to lapping the holes with a steel rod an lapping compound until the hole alignment was correct. A real PITA, to say the least. The Eagle Arms lower receiver parts kits were not real consistent in their quality. Most of the parts I ended up using were Bushmaster, including the barrels, which were of better quality at the time (Bushmaster got a lot better after they secured their first Gov't. contract). Still, the EA based weapons have served me well for the last 13-14 years.
The parts I've used in recent years from RRA and Stag/CMT are superior to those early EA parts, and the fit is also better on several currently made receivers over the EA's (Ameetec, Stag/CMT, RRA, etc.)