assuming you live in an FFA state that allows you to make a suppressor legally (no license required), you can came one out of a 1.5" sch 40 PVC pipe, soft wood or modeling foam (20lb) and an absurd amount of super glue (about 6 grams). you will also need a caliper (to make precise measurements with). cut the pipe to about 20" length. cut the foam or wood so that you have some 1/2" sheets. cut the foam/wood again so that you have little circular pieces that just fit snugly into the pipe. two pieces will be drilled out to the diameter of your rifle's barrel, first one about 8" from muzzle, second one just inset fro the muzzle. these two holds the pipe firmly to the gun. with those two in place and glued to the inside of the pipe, you can put in the 3rd piece and ready for the final cutting. the 3rd piece will be cut precisely where the barrel aligns to on the INSIDE of the suppressor. made the hole only marginally wider than the bullet, for .22LR that's a 0.229" hole. after making the cut and testing its precision out, glue in the piece. dribble super glue all over wherever needed, superglue significantly increases the hardness of the foam/wood so it doesn't fall apart over time. might need some super accelerator. btw, super glue is only sold in 2 gram tubes. 6 grams is ALOT of super glue. apply liberally but take care not to glue yourself to anything! Potato: doesn't work + you got mashed potato everywhere Pillow: doesn't work and you may set the pillow on fire Soda bottle: only works with very low powered ammunition- 25acp, 32 S&W, .22 short- and bottle changes the path of the bullet, making its very inaccurate.