Complete series of XM29 prototypes
thumb|none|400px|Very early side-by-side concept render
Earliest side-by-side OICW prototype - 5.56x45mm & 20mm (?). This one uses G36 magazines instead of STANAG.
Another early side-by-side OICW prototype - 5.56x45mm & 20mm (?)
1995 side-by-side OICW prototype - 5.56x45mm & 20mm (?)
1996-2000 over-under OICW prototypes - 5.56x45mm & 20mm
Minor 1999 model variant - 5.56x45mm & 20mm
Concept renders of several possible OICW configurations, seemingly based around the 1999 model. Note the KE module of 2 is an
MP7; seemingly that weapon spun off from OICW much like the
XM25
2000-2002 over-under OICW prototypes - 5.56x45mm & 20mm (last 25mm?)
Another 2002 prototype - 5.56x45mm & 20mm (25mm?)
Another late prototype - 5.56x45mm & 20mm (25mm?)
This one's labelled "AAI OICW," so might be a rejected alternate bid - 5.56x45mm & 20mm (25mm?)