  Mysterdogg, The original
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Info:

-Remington 870B: basically a customized or militarized Remington 870 Tac-14, which is originally a personal defense weapon. B stands for Breacher.
-Model unlocked.
-Adapted to works with the original anims.
-High resolution icon.

Note: 

-Slight bug in hands caused by the bounce of the running animation & the crouch shooting animation.

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Ready for Modloader usage!

weapon.dat:
$ SHOTGUN	INSTANT_HIT	35.0	45.0	349	-1	3	shotgun	       1	20	0.55	-0.01	0.10	0	0	1.0	1.5	6	40	7	6	40	7	28	2031
$ SHOTGUN	INSTANT_HIT	35.0	45.0	349	-1	3	shotgun	       1	20	0.55	-0.01	0.10	1	200	1.0	1.5	6	40	7	6	40	7	28	2031
$ SHOTGUN	INSTANT_HIT	35.0	45.0	349	-1	3	shotgun        1	20	0.55	-0.01	0.10	2	999	1.0	1.5	6	40	7	6	40	7	28	2031

Credits:

Model Edition/conversion: Mysterdogg
Weapon Icon Design: Mysterdogg
Source: GameBanana.com

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Feel free to edit it, include it in modpacks and even reupload it in your site, just don't forget to include my name as the original author. 
Find me on GTA Forums as Mysterdogg.