NexxSpeed CNC Aluminum Slide Stop - Tokyo Marui Hi-CAPA 4.3 / 5.1 / Gold Match / 1911 Color:Red All three panels stacked total:

All three panels stacked total:  128mm x 20mm x 20mm (thick)

which is only partial (not full blowback)

Only get this one if you have the much shorter rifle

The goggle offers improved audible clarity due to the streamlined ear panels with optimal ear-vent placement

Uses M28 magazines

NexxSpeed CNC Aluminum Slide Stop - Tokyo Marui Hi-CAPA 4.3 / 5.1 / Gold Match / 1911 Color:Red All three panels stacked total:The CNC Aluminum Slide Stop is machined with precise CNC tolerances from Aluminum and Stainless Steel for improvements in stability, durability and overall performance. It is designed with Delrin parts on the back and side to help Slide Stop operate more smoothly, reducing friction between metal and metal to avoid wear and tear on other parts.