Product Description
The HMG Caliber Conversion kit allows the user to convert their HMG StG rifle to their desired caliber easily. The HMG StG works off a castle nut system similar to the AR 15. Simply remove the fore grip to reveal the castle nut, remove barrel assembly with tool provided, replace with preferred caliber barrel assembly and tighten castle nut to specifications given. Finally, Replace the fore grip and insert your new bolt for a whole new shooting experience!
Check out this video of Mac, our head engineer, illustrating just how easy it is.
https://www.facebook.com/HMGunworks/videos/1255335367899413/
