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I tried what the OP is doing a while back when my Form 1 came back. No dice. The Z43-P's cocking tube is nonstandard and the HK33 pattern cocking tube support will not fully seat. I wish I would have taken a side by side picture of them when I had them out of the gun, but the Z43-P's cocking tube was very different from the standard HK33 pattern tube. It lacked a spring retention channel and the end had a large recessed section in it that is designed to clear a tab that is installed inside the Z43-P's cocking tube.
From what I could tell the Z43-P's cocking handle latches onto this tab inside the cocking tube, hence why it has that little tooth on the back of it.
Edit: Also OP it is my understanding that the RCM carrier that fits the 93/33 is a full auto carrier, so it won't fit into the Zenith receiver without milling out either the carrier or the receiver block.
From what I could tell the Z43-P's cocking handle latches onto this tab inside the cocking tube, hence why it has that little tooth on the back of it.
Edit: Also OP it is my understanding that the RCM carrier that fits the 93/33 is a full auto carrier, so it won't fit into the Zenith receiver without milling out either the carrier or the receiver block.
