This Frame Lock Pin M4 Metal Frame is designed to reduce wobbling in the main frame caused by frequent disassembly or use during airsoft games. It effectively fills gaps between the upper and lower receivers that can result from individual variances or manufacturing tolerances of metal frames.
 
The pin pushes the upper frame down and back diagonally against the lower frame, providing a more secure fit (see reference diagram/photo).
 
Replacement Instructions:
- Remove the original frame lock pin and replace it with this product.  
 
Important Notes for Replacement:  
- Do not forcefully hammer the pin in, as this may cause damage.  

- The pin's center may not align perfectly with the center of the hole in the frame when installed.  

- If assembly is difficult, disassemble this product and attach each piece to the respective frame before completing the assembly.  

- Be aware that this product may not fit some overseas-made frames, or there may be excessive gaps causing looseness.  

- Do not overtighten screws, as this may cause damage.
 
Exclusively for M4 metal frames  
 
Recommended For:  
- Tokyo Marui Next-Gen M4 Series  
- Our MG Upper/Lower Frames  
- KRYTAC M4 Series  
 
Material:Steel  
Surface Treatment:Hard Black Dyeing