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Old January 31, 2013, 03:41 PM   #24
m&p45acp10+1
Senior Member
 
Join Date: May 3, 2009
Location: Central Texas
Posts: 3,307
Look on the front of the barrel on the bottom below the sights. If it has a star stamped on it. Then it is a 4 grove barrel with a faster twist rate. The rear peep sight in it makes it much easier to pick up the sights.

Oh and if it is a star stamped barrel add 200 to 400 dollars to the value of the rifle. Star barrels are rare but not unheard of.
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