The following information is from the BAE Systems web article at this link:
The Marine Corps Transparent Armored Gun Shield – Reducible (MCTAGS-R) system was designed by BAE Systems to meet vehicle shipping height requirements for amphibious operations.
MCTAGS-R provides the same level of protection from small arms and IED fragments as the currently fielded MCTAGS system. The MCTAGS-R unique reducible height system allows the MCTAGS to collapse for storage on ship, air, and rail while only increasing the vehicle height by 6” and staying within the vehicle envelop.
MCTAGS-R has been configured for installation on the M1114 and M1151 HMMWVs, Medium Tactical Vehicle Replacement (MTVR), Logistic Vehicle System Replacement (LVSR), Mine Resistant Ambush Protected (MRAP) vehicle, and Joint Light Tactical Vehicle (JLTV). Any vehicle that has a ring mount can accept either the MCTAGS or the MCTAGS-R with a customized adapter plate.
You can view a datasheet on the MCTAGS-R at the BAE Systems website here:
Or you can download it from the HMMWV In Scale documents page here: