A system for perforating a wellbore comprising: a string conveyed downhole on tubing with a distal end, further comprising: a firing head with a first end coupled to the distal end of the tubing and a second end; a top sub with a first end coupled to the second end of the firing head and a second end; a first perforating gun with a first end coupled to the top sub and a second end; a first delay housing further comprising a single piece cylindrical housing having a common axis, a first end, a second end, and a housing length and a housing diameter, a first bore of a first diameter extending a first length along the common axis from the first end into the housing and having a flat bottom, a second bore of a second diameter extending a second length along the common axis from the second end into the housing and having a drill point bottom, a third bore of a third diameter extending a third length along the common axis from the second end into the housing and having a flat bottom, a fourth bore of a fourth diameter extending a fourth length along the common axis from the first end into the housing and having a flat bottom, a thru hole along the common axis from the flat bottom of the third bore to the flat bottom of the first bore, wherein the first end of the first delay housing is coupled to the second end of the first perforating gun and a second end, wherein the first delay housing further comprises a firing pin located in the fourth bore, a percussion igniter in the first bore, and a delay fuse slideably engaged in the third bore, and a second perforating gun with a first end and a second end, wherein the first end of the second perforating gun is coupled to the second end of the delay housing. a firing head with a first end coupled to the distal end of the tubing and a second end; a top sub with a first end coupled to the second end of the firing head and a second end; a first perforating gun with a first end coupled to the top sub and a second end; a first delay housing further comprising a single piece cylindrical housing having a common axis, a first end, a second end, and a housing length and a housing diameter, a first bore of a first diameter extending a first length along the common axis from the first end into the housing and having a flat bottom, a second bore of a second diameter extending a second length along the common axis from the second end into the housing and having a drill point bottom, a third bore of a third diameter extending a third length along the common axis from the second end into the housing and having a flat bottom, a fourth bore of a fourth diameter extending a fourth length along the common axis from the first end into the housing and having a flat bottom, a thru hole along the common axis from the flat bottom of the third bore to the flat bottom of the first bore, wherein the first end of the first delay housing is coupled to the second end of the first perforating gun and a second end, wherein the first delay housing further comprises a firing pin located in the fourth bore, a percussion igniter in the first bore, and a delay fuse slideably engaged in the third bore, and a second perforating gun with a first end and a second end, wherein the first end of the second perforating gun is coupled to the second end of the delay housing.