Man I have been here a few days, and I appreciate how freely information moves. I hadn't heard of the hybrid tube from AGR yet, but since I want to add a regulator I guess JSAR is the winner today.Two of the rifles in the picture I posted have the JSAR aluminum tube (two lower) and two (the upper two) have a AGR hybrid tube. The black side lever is mostly JSAR parts. AGR makes a hybrid tube that retains the steel aft section but has an aluminum forward section. The JSAR is factory dimensions including the ID so it can be regulated. The AGR part has a thicker sidewall and cannot take a regulator. Both knock weight off and improve balance.
The advantage of the hybrid tubes is that a conventional hammer can be used. The all aluminum JSAR tube must use a Delrin or plastic hammer. Both are wonderful.
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