Hello to all, I've had a chance to take apart one of the early Numrich drum magazines and made some interesting discoveries? First of all, the magazine was being worked on because of insufficient tension when fully loaded? When I checked the tension, there was barely 5 pounds at full lock, that is about where original drum mag springs start!!! It should have been around 10 pounds at that point. I removed the mainspring for inspection, and discovered it is approx. .080" less width then the originals as well???... Soooo, I had a chance to install one of my new GTHQ reproduction mainsprings and wind it full tight to the lock point. Good news is... it fit! Best news is, it was the correct tension!
.... I loaded it up to 32 rounds, and with the firing pin removed, and hand cycled all of them thru without a hitch! Ran perfect!
... I'm pretty happy! If you're having trouble with your repro drum not functioning, the spring tension could well be the trouble! BTW, unless you're going to drop into an enemy trench in the next fifteen minutes or so, I would recommend loading all drums, original or repro, to 25 rounds max! The last half doz or so, really puts a strain on the whole assembly?? Well, best to all, til...lat'r....GT.....
