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2/26/2008 6:58:41 PM EDT
What's the differnece between the 2?
2/27/2008 1:34:11 PM EDT
[#1]
The 500 is Mossberg's lower end and sporting gun.

The 590 series is the 500 beefed up gun for use by police and military.

The 500 has a barrel assembly that attaches to the end of the magazine tube with a knob.  The magazine tube can't be opened up easily for cleaning.

The 590 series copies the Remington 870 design, where the barrel has a ring that fits over the magazine tube and is held on by a magazine cap.
The 590 magazine can easily be opened for straight through cleaning.

The 590-A1 is even stronger, with a thicker barrel and less use of plastic parts.
2/27/2008 6:47:52 PM EDT
[#2]
How much heavier is the A1?
2/27/2008 7:22:00 PM EDT
[#3]
bayonet lug.
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