(Price is cheaper if you pay via PayPal) Custom Engraving Available! This is a custom designed adapter for VSR10 and SSG10 rifles to be able to use M4 high caps and mid caps. You won't find any of these as cheap as mine, when it comes to quality. I have sold about 2 dozen at local fields, with 0 complaints. I can send pics and videos to prove it works. Comes assembled with main housing, mag release spring, and mag release. You can also use your own metal releases if desired!