The team was fully aware of the dangers of higher pressures when it designed its automatic rifle and rifle prototypes, said Dave Stouffer, director of business development for the GD-OTS team.
"Higher pressures in the weapon drive all sorts of unsavory things -- barrel wear … the stresses that go back on the bolt face, extraction [problems], premature part wear -- there's all sorts of unfavorable things higher pressure drives," he said.
The GD team chose a bullpup design -- which puts the magazine and bolt-carrier group behind the pistol grip and trigger group -- to avoid the problem and still meet the Army's requirements, Stouffer said.
"One of the benefits of a bullpup-style weapon is that you can run much lower pressures and still achieve the desired velocities because you have a longer barrel," Stouffer said.