Here is another downloadable report from DTIC:
This is a semi-annual report for ARPA’s Project AGILE covering the last half of 1963. For those who may not know, Project AGILE handled the research, development, and operational testing of various counter-insurgency weapons and equipment in South Vietnam. In this report, projects include Strip Bullets, Gyrojets, and SALVO-Squeezebore. There is even a picture showing how M2HB barrels were modified for use with the .50/.30 Squeezebore rounds.