So I bought the Pearce 2733 +1 extenders, wasn't too hard to get them on once I figured it out. Got the 10 rounds in (kinda tight) and went to insert the mag into the gun...wouldn't quite slide in all the way, so I pushed a little harder and it got up in there, but now something rattles! With the gun assembled, I shake it and can hear something moving around. Rack it back, can still hear it, just not as bad. Take the slide off and shake, can't hear a thing. Anyone know what this could be? I live in Jax, so if anyone knows of a good armorer around here, please let me know! Thanks in advance.