5.56 and 223 cal. are the same cartridge...........
500-1000 USD or so
a gunsmith needs to check both the ammo and rifle.
The Colt AR-15 is a sporter rifle
Have it checked over by a good gunsmith before you attmept this.
Depends on markings on upper.
Colt AR-15 Sporter Lightweight .223/5.56. 20" barrel marked with MP 5.56 NATO 1/7. approx D.O.M. 1993-1994.
yes, but don't shoot the P ammo too often
@ 40 inches.
Colt made a single action army revolver that used 32.23 ammo & I believe Winchester, Colt lightning, Savage & Remington made 32.20 rifles,if that answers your question
Contact Colt, on line aucitons.
DON'T DO THIS UNLESS THE MAKER SAYS IT IS SAFE TO DO SO!!!!!!!!!!!!!!!!