Ive never had immediate experience with dpt or hardy so cant compare directly sorry. They do well alongside the gunworks suppressors though. I would be looking more at the profile of the suppressor and how you want it to fit the rifle then decide which you prefer from there. I.e long and thin or short and fat etc. I dont remember hearing of anyone unhappy with a greystone and wouldnt fell nervous about making wrong decision in buying one.
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