The XA-4 ARGO was designed for the SecOps recon and marksmen units, which used a modified GS-221 to fit the long range role, so the RDA decided to design their own anti-infantry weapon that would be cabable of taking out targets at longer rabges then its predecessor. The XA-4 also has a bullpup configuration, however, the frame has a completely diffrent shape then the GS-221, that was used to fit it's role. The ARGO has a 16 round box-type magazine and the charging handle is located above the trigger guard and pistolgrip. The rifle also has a diffrent rifling in the barrel which increases accuracy and range. The buttstock of the XA-4 is longer at the top for a better comfort in use, and is rubber padded, The XA-4 ARGO is issued mainly to recon units.