
SIG MCX-R Regulator 16" 5.56
Best-engineered rifle of the feature-stripped group: piston-driven MCX upper, Magpul SGA Mossberg-pattern stock, full ambi controls, two-stage match trigger. Illinois dealers transfer it as a featureless ranch rifle.
- +Full ambi controls, short-stroke piston, and a two-stage match trigger
- +Standard STANAG magazine compatibility with existing AR-15 logistics
- +Stock interface accepts any Mossberg 500/590 shotgun stock
- −PICA lists "MCX rifles" and "SIG MCX" by name, a question the other feature-stripped rifles here do not raise
- −Highest price of any rifle in this guide
- −Magpul SGA stock LOP is long for shorter-statured shooters




















