Explosive assembly systems including a linear shaped charge end prime cap apparatus and related methods

An explosive assembly including a coupling structure comprising:

• a body formed from an elastomeric material comprising a shaft end section and an opposing neck protrusion section;
• wherein said shaft end section and opposing neck protrusion section are formed respectively with a first and second aperture that open into a first and second cavity section within said body, said first and second cavity sections open into each other, wherein said first cavity section is formed by a first interior cavity wall having a first distance between opposing sides of said first cavity section, wherein said second cavity section is formed by a second interior cavity wall having a second distance between opposing sides of said second cavity section, wherein the first distance is larger than the second distance;
• a linear shaped charge (LSC);
• wherein said shaft end section is formed with a flexible interference fit adapted to receive and retain the linear shaped charge up to a first force;
• wherein said second cavity section within said opposing neck protrusion section is formed comprising a plurality of spaced apart protrusions or fins that extend a third distance away from said second interior cavity wall, wherein said plurality of spaced apart protrusions or fins are adapted or formed to displace, securely grip;
• and retain a initiator structure inserted into said second cavity section through said opposing neck protrusion up to a second force;
• wherein said opposing neck protrusion section comprises a plurality of external stiffening sections adapted to increase structural rigidity of said opposing neck protrusion formed on an exterior wall of said opposing neck protrusion section and coupled to a portion of said shaft end section that extends away from said opposing neck protrusion section.