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AR Help Barrel question Please help!!!

pjohnson42024

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ok I just built a rifle with an 18" 1/8 twist socom barrel midlength gas system and a troy muzzle break if i need to give more details i can i was using basic federal ammo 55gr and cant get a group better than like 8" but with my dpms i can get 1" groups with the same ammo did i do something wrong with my build or did i get a bad barrel ???
 
LOT of variables there. Really hard to diagnose with out a lot more info. Even then, it will just be an educated guess.
 
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