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 . <EOS>