This is a mod of the handguard that came with my MKE AP5-P (MP5K). I did not have the real version of this handguard while I was making this model, so I cannot guarantee that this is the same or serves the same function as the OEM. I modeled this to fit my Kaw Valley Mach 3 Comp which is 1.3"in in diameter. I recommend you print all my files with 100% infill.