Parkwest Arms Ken Howell Sling Swivel Set. These sling swivels are the same swivels that Parkwest Arms uses on their high-quality firearms. The Ken Howell Sling swivel set from Parkwest Arms features two color case hardened sling swivels as well as (4) screws. The Parkwest Arms Ken Howell sling swivel kit must be fit by a qualified gunsmith or custom rifle builder.