this is a couple of mods i made to 182515
http://www.instructables.com/id/Turret-Rifle-I-will-think-of-a-name/

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Sweet, very nice. I really like it. Foregrip is sweet, as is the trigger guard. What are those things under the stock?
You might be able to get more range out of it if you remove the barrel in front, it should only slow the bullets down this way. Just my advice.