Looking at 2 used USGI QH receivers. one comes with the correct detatchable tube & one does not. I've found a USGI new tube if need be, but there are no recoil springs included.

What are the differences in the Quality Hardware recoil spring & tube design?

Is the recoil spring the exact same spring used in the other USGI manufactures more dependable design?

Also, is there some kind of guide rod used to keep it all attached to the slide on a QH?

Thanks guys....
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