Hi Giovanni and welcome. This is for Picatinny Rails. If you have an MLOK HandGuard, you will need an MLOK Picatinny rail slot : budsgunshop.com/product_info.php/products_id/30188/grovtec+rail+mlok+2.2+5+slot - Cheers and stay safe!

This easily fits a standard piccatinny rail.

It fits a standard picattiny rail see ******
Features and Specifications:
Manufacturer Number: RFG
Mission First Tactical AR-15 REACT Folding Vertical Grip Black
Allows deployment in either vertical or horizontal position Push button allows easy selection of position
Secure watertight storage compartment
Customizable foam storage block with quick access tab diminishes rattle
Flat non-slip bottom surface aids in supported firing positions Weight: 3.73 oz
Height: 4.314"
Width: 1.524"
Length: 2.205"
Color: Black
*******Fits:
Standard AR-15 Picatinny Rail