The grenade launcher and rifle are completely independent, and can be used as such. The HK G36 (the 10" 5.56 rifle portion of the gun is just a hk g36 with an ugly body)has a folding stock to make it fully usable on its own. I have read that the intent is/was to replace all infantry weapons(except long range sniper) with this gun. Although it wouldn't necessarily be issued complete to each soldier. The HK G36 portion is supposed to be given in place of the SAW with 100rd drum mags. Average soldier gets just the rifle, and someone gets a grenade launcher(in place of the M79 or HK 40mm). They can be combined if necessary. More of the clinton joint multiuse crap(like the JDAMs, JASSMs, and JSFs). Hopefully it won't be issued in 2005 like it has been previously stated.
The Clinton administration figured making one weapon everyone used would give him the ability to spend more money on liberal crap instead of the military. I mean, the navy, air force, and marines are all supposed to use the ONE Joint Strike Fighter design in the future.
Come on, they need to use the right tool for the job.
I personally think a new infantry weapon should be developed using today's technology. But the OICW isn't it. Also, anything battery powered on a service rifle can't be good.