Clamps work great
I bought my parts directly off amazon, since they are only Quick Fist mounts, and then got some mounting hardware at Home Depot. Spent about $24.
For those reading this, you have the option of buying just the rubber clamps from us (hit the drop down menu and select the options that say "JUST THE CLAMP") and purchasing two 1/4"-20 x 5/8" bolts with two 1/4-20 nuts for the handguard clamp and one #10-24 x 5/8" flat head machine screw with one #10-24 nut for the buffer tube clamp. Just drill through the panel in the desired mounting location and secure the clamps to the panel by passing the bolts through and secure with the nuts on the back side. The reason we make and provide the tapped aluminum backer plates is so that you have a flush mount with no hardware protruding that may damage your seat. But if you want a more cost effective option do as described above.