These base plates are CNC machined from billet aluminum and allow for positively seating Para/RIA style magazines in pistols that have mag well funnels.  

These black base plates are 0.200" taller than the traditional steel Para magazine plate and protrude slightly past a RIA mag well funnel.  It does not increase capacity.

Dawson Precision makes these plates in three sizes - 0.100, 0.200 and 0.300.  We have separate product listings for each.

This is for the base plate and purple interlocking tab shown.  No pistols or other parts are included.