i took 2x2 square tubing, then 2x2 angle , free from a jobsite, and stuck em in 5 gal buckets. then got some bags of quickcrete and let it set. welded 10x10 x 3/8 plates up high but facing down at an angle to deflect . it took re-doing them to get to this point but now , 5 total, theyve had thousands of rds at em and i plan on thousands more. got maybe 30 bucks in all of it.