Is the DX 13 made of mimetic Polly Alloy?
Bend over
On a more serious note this came up in a Terminator book that followed the Cameron timeline. At the end of the last book it shows up what went on at the time displacement facility.
John Connor asks for a volunteer damn well knowing who is going to put his hand up. Reese specifically asks if he can take future weapons to which the scientist guy tells him "Not unless you can fit it up your @ss" He than goes on to explain how only living tissue can go through.
John sends Reese through and than he sends Uncle Bob through and than blows the place.
The best part of this scene is that Sarah is still alive and joined John on the mission. She hides herself out of sight of Reese and watches him leave for the past in order to save her life. Such a bittersweet moment.