Greetings, Just picked up a new AZ-C15M4PRE for $950.00, i think the dealer gave me the wrong price as it says it retails for $1135.00 on the bushmaster website, oh well his loss. Just finished firing  the first 120 rounds and got it sighted in at 100yds with the basic sights. The only problem i had was with the mag that came with it a couple of rounds got jammed in the grooves of the chamber, i also bought a spare mag that was manufactured by Center Industries Corp and had no problems with rounds jamming. Was wondering if anyone out there with the same gun has had this or any other problems i should be concerned about.

CrazyD.
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Check out the problem someone had with new mags in the troubleshooting section. Maybe that is your problem here?